MATHESON, Circuit Judge.
Officer Barton Devos discovered a gun magazine containing ammunition during a protective pat down of Cruz Garcia. A grand jury charged Mr. Garcia with being a felon in possession of ammunition in violation of 18 U.S.C. §§ 922(g)(1) and 924(a)(2).
Mr. Garcia moved to suppress evidence of the ammunition on Fourth Amendment grounds, contending the pat down search was unjustified. The district court denied the motion after concluding the arresting officer had reasonable suspicion that Mr. Garcia was armed and dangerous. Mr. Garcia entered a conditional guilty plea, reserving the right to appeal the denial of his motion to suppress. Exercising jurisdiction under 28 U.S.C. § 1291, we affirm.
I. BACKGROUND
A. Factual History 1
On February 4, 2012, at approximately 7:45 p.m. in Roswell, New Mexico, Patrol Officer Devos of the Roswell Police Department conducted a pat-down search of Mr. Garcia after a traffic stop.
Officer Devos was driving on sparsely travelled South Monroe Avenue when he noticed a green Hyundai with a cracked windshield going in the opposite direction. Concerned the cracks obscured the driver’s view, Officer Devos turned around and pulled over the Hyundai.
Officer Devos approached the driver, who identified himself as Gilbert Romero. Mr. Garcia was sitting in the passenger seat. A records check on “Gilbert Romero” showed a suspended license for that name. Officer Devos arrested the driver.2 After the arrest, Officer Devos decided to have the vehicle towed because it could not [1141]*1141be driven safely with its cracked windshield. Before towing the vehicle, however, Roswell Police Department regulations required Officer Devos to inventory the contents of the car. Due to staffing limitations, Officer Devos had to do the inventory by himself.
Before the inventory, Officer Devos asked Mr. Garcia to exit the vehicle. Mr. Garcia did not make eye contact with Officer Devos, and he kept playing with his hands. Officer Devos thought Mr. Garcia was nervous or possibly hiding something.
Officer Devos recognized Mr. Garcia from a recent encounter and had learned months earlier from a fellow officer that Mr. Garcia had a criminal history, which included at least one violent felony. Officer Devos learned that the most recent felony was a 2003 armed robbery. Officer Devos also knew Mr. Garcia was “a known drug user, particularly heroin.” ROA, Vol. Ill at 11.
Officer Devos had encountered Mr. Garcia two weeks earlier. On January 21, 2012, Officer Devos was driving in front of Mr. Garcia’s residence when he saw Mr. Garcia on the front porch. Knowing a warrant was out for Mr. Garcia’s arrest, Officer Devos said, “Cruz, stop.” ROA, Vol. Ill at 9. Mr. Garcia looked at Officer Devos and ran inside the house. Officer Devos approached the front porch and told a woman there to tell Mr. Garcia to come out because there was a warrant out for his arrest. Instead of coming out the front door, Mr. Garcia ran out the back door and down an alley.
Officer Devos chased Mr. Garcia on foot and finally cornered him. Mr. Garcia turned toward Office Devos and “took a fighting stance with his fists clenched.” ROA, Vol. Ill at 10. Officer Devos deployed his Taser, striking Mr. Garcia in the chest and abdomen. Shortly thereafter, other officers arrived and took Mr. Garcia into custody. Mr. Garcia was not armed at any point during this encounter.
On the evening of the traffic stop, Officer Devos decided to pat Mr. Garcia down for weapons because of (1) his previous encounter with Mr. Garcia, (2) Mr. Garcia’s criminal history, which included an armed robbery felony, (3) his concern that he was alone and would have to turn his back to Mr. Garcia while performing the inventory, (4) Mr. Garcia’s nervousness (as indicated by his avoiding eye contact and fidgeting with his hands), and (5) Mr. Garcia’s history with drugs.
During the pat down, Officer Devos felt what he thought was a gun magazine in Mr. Garcia’s front right pocket. He asked what the object was, and Mr. Garcia answered, “A gun clip.” ROA, Vol. Ill at 23. Officer Devos asked Mr. Garcia to pull the object out of his pocket. Mr. Garcia complied and placed a magazine on top of the Hyundai. The magazine contained seven .380 caliber Winchester cartridges. Officer Devos then handcuffed Mr. Garcia and had him sit on the curb until the inventory was finished. After the inventory, Officer Devos took off the handcuffs and told Mr. Garcia he was free to go.
Later, Officer Devos arrested Mr. Garcia for being a felon in possession of ammunition.
B. Procedural History
Because of his prior convictions,3 a federal grand jury indicted Mr. Garcia on one [1142]*1142count of felony possession of ammunition, in violation of 18 U.S.C. §§ 922(g)(1) and 924(a)(2). Mr. Garcia moved to suppress the evidence found during the pat down, arguing the initial stop was not based on reasonable suspicion of a traffic offense and Officer Devos did not have reasonable suspicion that Mr. Garcia was armed and dangerous.
After assigning the case to a magistrate judge and considering the magistrate judge’s Proposed Findings and Recommended Disposition, the district court held Officer Devos had reasonable suspicion to stop the vehicle and pat down Mr. Garcia. The district court based the pat-down decision on several factors, including (1) Mr. Garcia’s combative conduct during his previous encounter with Officer Devos; (2) Mr. Garcia’s criminal history, which included an armed robbery; (3) that “Officer Devos made this traffic stop while he was alone, at night, on a road that does not have much traffic” and had to turn his back to Mr. Garcia to conduct the inventory search; and (4) Mr. Garcia’s nervous behavior.4 ROA, Vol. I at 94-95. The district court found reasonable suspicion because a “reasonably prudent individual in Officer Devos’s circumstances would likely be concerned for his safety.” Id. at 95.
Mr. Garcia entered a conditional guilty plea, reserving his right to appeal the district court’s ruling on the motion to suppress. The district court sentenced Mr. Garcia to 30 months in prison to be followed by three years of supervised release. Mr. Garcia now appeals the denial of his motion to suppress on the issue of reasonable suspicion to justify the pat down.5
II. DISCUSSION
A. Standard of Review and Legal Background
In reviewing a district court’s denial of a motion to suppress, we review factual findings for clear error, viewing the evidence in the light most favorable to the Government. See United States v. Hunter, 663 F.3d 1136, 1141 (10th Cir.2011); United States v.
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MATHESON, Circuit Judge.
Officer Barton Devos discovered a gun magazine containing ammunition during a protective pat down of Cruz Garcia. A grand jury charged Mr. Garcia with being a felon in possession of ammunition in violation of 18 U.S.C. §§ 922(g)(1) and 924(a)(2).
Mr. Garcia moved to suppress evidence of the ammunition on Fourth Amendment grounds, contending the pat down search was unjustified. The district court denied the motion after concluding the arresting officer had reasonable suspicion that Mr. Garcia was armed and dangerous. Mr. Garcia entered a conditional guilty plea, reserving the right to appeal the denial of his motion to suppress. Exercising jurisdiction under 28 U.S.C. § 1291, we affirm.
I. BACKGROUND
A. Factual History 1
On February 4, 2012, at approximately 7:45 p.m. in Roswell, New Mexico, Patrol Officer Devos of the Roswell Police Department conducted a pat-down search of Mr. Garcia after a traffic stop.
Officer Devos was driving on sparsely travelled South Monroe Avenue when he noticed a green Hyundai with a cracked windshield going in the opposite direction. Concerned the cracks obscured the driver’s view, Officer Devos turned around and pulled over the Hyundai.
Officer Devos approached the driver, who identified himself as Gilbert Romero. Mr. Garcia was sitting in the passenger seat. A records check on “Gilbert Romero” showed a suspended license for that name. Officer Devos arrested the driver.2 After the arrest, Officer Devos decided to have the vehicle towed because it could not [1141]*1141be driven safely with its cracked windshield. Before towing the vehicle, however, Roswell Police Department regulations required Officer Devos to inventory the contents of the car. Due to staffing limitations, Officer Devos had to do the inventory by himself.
Before the inventory, Officer Devos asked Mr. Garcia to exit the vehicle. Mr. Garcia did not make eye contact with Officer Devos, and he kept playing with his hands. Officer Devos thought Mr. Garcia was nervous or possibly hiding something.
Officer Devos recognized Mr. Garcia from a recent encounter and had learned months earlier from a fellow officer that Mr. Garcia had a criminal history, which included at least one violent felony. Officer Devos learned that the most recent felony was a 2003 armed robbery. Officer Devos also knew Mr. Garcia was “a known drug user, particularly heroin.” ROA, Vol. Ill at 11.
Officer Devos had encountered Mr. Garcia two weeks earlier. On January 21, 2012, Officer Devos was driving in front of Mr. Garcia’s residence when he saw Mr. Garcia on the front porch. Knowing a warrant was out for Mr. Garcia’s arrest, Officer Devos said, “Cruz, stop.” ROA, Vol. Ill at 9. Mr. Garcia looked at Officer Devos and ran inside the house. Officer Devos approached the front porch and told a woman there to tell Mr. Garcia to come out because there was a warrant out for his arrest. Instead of coming out the front door, Mr. Garcia ran out the back door and down an alley.
Officer Devos chased Mr. Garcia on foot and finally cornered him. Mr. Garcia turned toward Office Devos and “took a fighting stance with his fists clenched.” ROA, Vol. Ill at 10. Officer Devos deployed his Taser, striking Mr. Garcia in the chest and abdomen. Shortly thereafter, other officers arrived and took Mr. Garcia into custody. Mr. Garcia was not armed at any point during this encounter.
On the evening of the traffic stop, Officer Devos decided to pat Mr. Garcia down for weapons because of (1) his previous encounter with Mr. Garcia, (2) Mr. Garcia’s criminal history, which included an armed robbery felony, (3) his concern that he was alone and would have to turn his back to Mr. Garcia while performing the inventory, (4) Mr. Garcia’s nervousness (as indicated by his avoiding eye contact and fidgeting with his hands), and (5) Mr. Garcia’s history with drugs.
During the pat down, Officer Devos felt what he thought was a gun magazine in Mr. Garcia’s front right pocket. He asked what the object was, and Mr. Garcia answered, “A gun clip.” ROA, Vol. Ill at 23. Officer Devos asked Mr. Garcia to pull the object out of his pocket. Mr. Garcia complied and placed a magazine on top of the Hyundai. The magazine contained seven .380 caliber Winchester cartridges. Officer Devos then handcuffed Mr. Garcia and had him sit on the curb until the inventory was finished. After the inventory, Officer Devos took off the handcuffs and told Mr. Garcia he was free to go.
Later, Officer Devos arrested Mr. Garcia for being a felon in possession of ammunition.
B. Procedural History
Because of his prior convictions,3 a federal grand jury indicted Mr. Garcia on one [1142]*1142count of felony possession of ammunition, in violation of 18 U.S.C. §§ 922(g)(1) and 924(a)(2). Mr. Garcia moved to suppress the evidence found during the pat down, arguing the initial stop was not based on reasonable suspicion of a traffic offense and Officer Devos did not have reasonable suspicion that Mr. Garcia was armed and dangerous.
After assigning the case to a magistrate judge and considering the magistrate judge’s Proposed Findings and Recommended Disposition, the district court held Officer Devos had reasonable suspicion to stop the vehicle and pat down Mr. Garcia. The district court based the pat-down decision on several factors, including (1) Mr. Garcia’s combative conduct during his previous encounter with Officer Devos; (2) Mr. Garcia’s criminal history, which included an armed robbery; (3) that “Officer Devos made this traffic stop while he was alone, at night, on a road that does not have much traffic” and had to turn his back to Mr. Garcia to conduct the inventory search; and (4) Mr. Garcia’s nervous behavior.4 ROA, Vol. I at 94-95. The district court found reasonable suspicion because a “reasonably prudent individual in Officer Devos’s circumstances would likely be concerned for his safety.” Id. at 95.
Mr. Garcia entered a conditional guilty plea, reserving his right to appeal the district court’s ruling on the motion to suppress. The district court sentenced Mr. Garcia to 30 months in prison to be followed by three years of supervised release. Mr. Garcia now appeals the denial of his motion to suppress on the issue of reasonable suspicion to justify the pat down.5
II. DISCUSSION
A. Standard of Review and Legal Background
In reviewing a district court’s denial of a motion to suppress, we review factual findings for clear error, viewing the evidence in the light most favorable to the Government. See United States v. Hunter, 663 F.3d 1136, 1141 (10th Cir.2011); United States v. Karam, 496 F.3d 1157, 1161 (10th Cir.2007). We review de novo the ultimate determination of the reasonableness of a search under the Fourth Amendment. Karam, 496 F.3d at 1161.
The Fourth Amendment protects persons “against unreasonable searches and seizures.” U.S. Const, amend. IV. A pat down is a search and therefore must be reasonable. See Terry v. Ohio, 392 U.S. 1, 19, 88 S.Ct. 1868, 20 L.Ed.2d 889 (1968). Pat-down searches are constitutional when an officer has reasonable suspicion that an individual is “armed and dangerous.” United States v. Rice, 483 F.3d 1079, 1082 (10th Cir.2007).
The primary justification for a pat-down search is an officer’s concern “that [his or her] safety or that of others was in danger.” Terry, 392 U.S. at 27, 88 S.Ct. 1868. Even when an officer had limited “specific information leading him to believe that [an individual] was armed or dangerous” and no knowledge of the individual’s having possessed a weapon, we have held that the officer’s safety concern justified a pat down. United States v. McRae, 81 F.3d 1528, 1536 (10th Cir.1996) (“The facts available to Officer Colyar here (he was alone on an isolated stretch of highway, he [1143]*1143was about to engage in a search of a car, and he had just been warned to approach Mr. McRae with ‘extreme caution’) would warrant a man of reasonable caution to believe that a frisk would be necessary to protect himself.”);6 see also United States v. Manjarrez, 348 F.3d 881, 886-87 (10th Cir.2003) (“The purpose of the limited pat-down search is not to discover evidence of a crime, ‘but to allow the officer to pursue his investigation without fear of violence.’ ”) (quoting Adams v. Williams, 407 U.S. 143, 146, 92 S.Ct. 1921, 32 L.Ed.2d 612 (1972)); United States v. Brown, 232 F.3d 589, 594 (7th Cir.2000) (individual “acting erratically and somewhat aggressively throughout the late afternoon to early evening period” roused officer’s concern for his own safety and thus justified the officer’s pat-down search, despite no specific suspicion of a weapon).
The reasonable suspicion needed to justify a pat-down search “need not rise to the level required for probable cause, and it falls considerably short of satisfying a preponderance of the evidence standard.” United States v. Arvizu, 534 U.S. 266, 274, 122 S.Ct. 744, 151 L.Ed.2d 740 (2002). It must meet only a “minimum level of objective justification.” Rice, 483 F.3d at 1083 (quotations omitted). The reasonable suspicion analysis does not consider each of an officer’s observations in isolation, but rather is “based on the totality of the circumstances, taking into account an officer’s reasonable inferences based on training, experience, and common sense.” Id. The totality of the circumstances test looks at the officer’s knowledge and observations as well as the circumstances in which the officer is working. See id. at 1084-85.7
[1144]*1144B. Reasonable Suspicion Justified the Pat Down
Each factor Officer Devos identified is relevant to the reasonable suspicion analysis, even if not sufficient by itself to decide the outcome. Those factors and Officer Devos’s concern for his safety establish reasonable suspicion sufficient to pass constitutional muster.
We first analyze each of the factors: (1) Officer Devos’s previous encounter with Mr. Garcia, (2) Mr. Garcia’s criminal history, (3) Officer Devos’s working conditions, and (4) other, less significant factors. We then present a totality of the circumstances analysis.
1. Mr. Garcia’s Previous Encounter with Officer Devos
Two weeks before the traffic stop and pat down of Mr. Garcia’s person, Mr. Garcia ran from Officer Devos and then aggressively confronted him when he could no longer run. Officer Devos used a Taser on Mr. Garcia to subdue him. The district court found this encounter to be a significant reasonable suspicion factor. Mr. Garcia and the dissent contend this incident should carry little weight because Mr. Garcia was not armed. Because the reasonable suspicion test is broad enough to include consideration of aggressive actions— including actions without weapons — we agree with the district court that this encounter supports reasonable suspicion.
This circuit and other circuits have determined that an officer’s knowledge of an individual’s recent aggressive conduct is relevant to reasonable suspicion. In United States v. Sanchez, 519 F.3d 1208, 1216 (10th Cir.2008), we held that officers had reasonable suspicion to perform a pat-down search of Mr. Sanchez after (1) receiving information from an informant that an individual had slapped a woman and (2) finding a concealed weapon on an occupant of a vehicle associated with the assault but not the vehicle in which Mr. Sanchez was a passenger. See also Brown, 232 F.3d at 594 (individual “acting erratically and somewhat aggressively throughout the late afternoon to early evening period” by running over a fence with his vehicle roused officer’s concern for his own safety and thus justified the officer’s pat-down search, despite no specific suspicion of a weapon); United States v. George, 732 F.3d 296, 300 (4th Cir.2013) cert. denied, — U.S. --, 134 S.Ct. 1530, 188 L.Ed.2d 462 (2014) (officer’s observation of “vehicle aggressively chasing the vehicle in front of it, following by less than one ear length” and turning right through a red traffic light fast enough “to cause the vehicles’ tires to screech” contributed, among other factors, to the officer’s reasonable suspicion sufficient to conduct a pat-down search for weapons).
Although Mr. Garcia did not possess a weapon during the previous encounter, the reasonable suspicion test does not require Officer Devos to be “absolutely certain that the individual is armed; [rather] the issue is whether a reasonably prudent man in the circumstances would be warranted in the belief that his safety or that of others was in danger.” Terry 392 U.S. at 27, 88 S.Ct. 1868. Officer Devos knew Mr. Garcia was able and willing to act combatively toward police officers in confrontational situations. Requiring Mr. Garcia to exit a vehicle following the arrest of the driver to allow Officer Devos to inventory and impound that vehicle had as much or more potential to be a confrontational situation as the previous encounter. Officer Devos previously tasered Mr. Garcia and facilitated his arrest, which could reasonably raise Officer Devos’s suspicion that Mr. Garcia had a motive for revenge.
In sum, Officer Devos’s previous encounter with Mr. Garcia provided ample ground for officer safety concern even [1145]*1145though Mr. Garcia did not have a gun on that occasion.
2. Mr. Garcia’s Criminal History
Officer Devos knew Mr. Garcia had a criminal record that included a 2003 armed robbery. Mr. Garcia and the dissent contend the conviction’s nine-years-old status marginalizes its relevance for reasonable suspicion. We disagree. Not only did Mr. Garcia previously possess a weapon, he used it in a crime of violence. We do not think the passage of time significantly diminishes the relevance of this criminal history in the context of an officer in the field assessing a safety risk. See United States v. Santos, 403 F.3d 1120, 1132 (10th Cir.2005) (“[I]n conjunction with other factors, criminal history contributes powerfully to the reasonable suspicion calculus.”).
An officer’s knowledge of past criminal conduct is probative of whether the defendant is armed and dangerous, especially if a weapon was involved. See, e.g., Rice, 483 F.3d at 1081-82 (the report from police dispatch mentioned that Mr. Rice was “known to be armed and dangerous” (quotations omitted));8 United States v. Garcia, 459 F.3d 1059, 1064 (10th Cir.2006) (stating that a defendant’s history of drug trafficking- — which itself is often connected with firearms — contributes to an officer’s reasonable suspicion that the defendant is armed and dangerous); McRae, 81 F.3d at 1536 (drug trafficking).9
Our decision in McRae is instructive because there was no direct evidence that Mr. McRae had ever actually possessed a gun. Mr. McRae had been convicted of drug trafficking. Although the dates of Mr. McRae’s convictions were unreported, we said the officer could reasonably infer previous gun possession. In this case, Mr. Garcia was found guilty of armed robbery — and, therefore, found to have actually possessed a weapon — beyond a reasonable doubt. See United States v. Powell, 666 F.3d 180, 187-88 (4th Cir.2011) (finding an officer’s knowledge of a past armed robbery conviction of undetermined age relevant to reasonable suspicion, but insufficient on its own).
Officer Devos could infer from Mr. Garcia’s criminal record that he had the ability to secure a weapon and the propensity to use it in criminal activity. We conclude Officer Devos’s knowledge of the armed robbery conviction supported reasonable suspicion that Mr. Garcia was armed and dangerous.
3. Officer Safety: Time, Place, and the Inventory Search
Officer Devos stopped the vehicle on a sparsely travelled street. He needed to turn his back to Mr. Garcia to conduct the inventory search. The district court properly relied on these factors in determining that Officer Devos was reasonably concerned for his safety.
Mr. Garcia distinguishes this case from those involving an arrest or pat down in high-crime areas late at night. He is correct to a degree. But the circumstances here — a nighttime stop in a sparsely travelled area — -would still have heightened a [1146]*1146reasonable officer’s concerns for safety, especially in the context of a single-officer inventory search. This court has twice ruled that similar circumstances were relevant to officer safety. See McRae, 81 F.3d at 1536; Manjarrez, 348 F.3d at 887.
In McRae, an officer frisked Mr. McRae after obtaining consent to search Mr. McRae’s vehicle. McRae, 81 F.3d at 1531-32. The court concluded the officer had reasonable suspicion to frisk Mr. McRae because (1) “a search of the car might compel Officer Colyar to turn his back on Mr. McRae, and the two men were on an isolated stretch of highway”; (2) the officer received information that Mr. McRae has a criminal history and should be approached with “extreme caution”; and (3) Mr. McRae put on his jacket before exiting his vehicle, and “a jacket is a likely place in which to store a weapon.” Id. at 1536.
In Manjarrez, an officer frisked Mr. Manjarrez after obtaining consent to search Mr. Manjarrez’s vehicle. Manjarrez, 348 F.3d at 884. Unlike the officer in McRae, however, the officer in Manjarrez had no knowledge of any previous criminal history, and Mr. Manjarrez was not acting suspiciously. Id. The court concluded that the officer “could not reasonably be expected to leave Defendant in his patrol car, turn his back on Defendant, insert his head into Defendant’s car, and search the car without first checking Defendant for weapons.” Id. at 887.
Although neither McRae nor Manjarrez are factually identical to the present case,10 both suggest Officer Devos’s circumstances — including working alone on a sparsely travelled street and having to turn his back to Mr. Garcia — support reasonable suspicion.
4. Other Factors: Nervousness and Drug Use
Officer Devos also cited Mr. Garcia’s nervous behavior and his knowledge of Mr. Garcia’s drug use history as contributing to his decision to pat Mr. Garcia down. Nervous behavior11 and drug use history12 [1147]*1147may be relevant to reasonable suspicion, but we consider both as having minimal impact on the analysis here.
5. Totality of the Circumstances
The totality of the circumstances includes Officer Devos’s knowledge, the conditions under which he was working, and his concern for his own safety. See McRae, 81 F.3d at 1536.
By arresting the vehicle’s driver and following Police Department protocol to perform the mandatory vehicle inventory, Officer Devos needed to deal with the vehicle’s passenger, Mr. Garcia. Officer Devos knew Mr. Garcia (1) previously sought to evade arrest, took a combative stance when escape was not feasible, and had to be tased; and he knew Mr. Garcia (2) had a violent criminal past, which included an armed robbery.
In addition to this knowledge, Officer Devos needed to conduct an inventory search of the Hyundai after sundown without other officer support on an isolated road with his back turned to Mr. Garcia. In the two Tenth Circuit cases that have considered an officer’s having to turn his or her back to a defendant, we required little beyond this concern to support the officer’s reasonable suspicion. See McRae, 81 F.3d at 1536; Manjarrez, 348 F.3d at 887.
Based on the totality of the circumstances, we conclude Officer Devos had reasonable suspicion sufficient under the Fourth Amendment to pat down Mr. Garcia.
III. CONCLUSION
For the foregoing reasons, we affirm the district court’s denial of Mr. Garcia’s motion to suppress.