Marines with Marine Fighter Attack Squadron (VMFA) 121 “Green Knights,” conduct a maintenance check on an F-35B Lightning II on the flight line aboard Marine Corps Air Station Yuma, Arizona, Aug. 18, 2014. - Marines with Marine Fighter Attack Squadron (VMFA) 121 “Green Knights,” conduct a maintenance check on an F-35B Lightning II on the flight line aboard Marine Corps Air Station Yuma, Arizona, Aug. 18, 2014.

MARINE CORPS AIR STATION MIRAMAR, Calif.—Officer Jason Frederickson, a civilian police officer with the Provost Marshalls Office, provides rear security while a fellow officer clears a room at Navy Marine Reserve Center aboard Marine Corps Air Station Miramar, Calif., April 2. The scenarios are conducted in the most authentic method possible. - MARINE CORPS AIR STATION MIRAMAR, Calif.—Officer Jason Frederickson, a civilian police officer with the Provost Marshalls Office, provides rear security while a fellow officer clears a room at Navy Marine Reserve Center aboard Marine Corps Air Station Miramar, Calif., April 2. The scenarios are conducted in the most authentic method possible.

Cpl David Mayes, the chief trainer for the military working dog section with PMO and a Johnstown, Pa., native and Xxerxes, his military working dog, conduct drug detection training at the Provost Marshal’s Office aboard Marine Corps Air Station Miramar, Calif., Dec 4. The dogs train to find the scent of drugs can differentiate the smells of several drugs. - Cpl David Mayes, the chief trainer for the military working dog section with PMO and a Johnstown, Pa., native and Xxerxes, his military working dog, conduct drug detection training at the Provost Marshal’s Office aboard Marine Corps Air Station Miramar, Calif., Dec 4. The dogs train to find the scent of drugs can differentiate the smells of several drugs.