Marines with Marine Wing Support Squadron 371, based out of Marine Corps Air Station Yuma, perform shooting drills with their M16A4 service rifles during a squadron field exercise at the U.S. Army Yuma Proving Ground training facility in Yuma, Ariz., Wednesday, March 9, 2016. - Marines with Marine Wing Support Squadron 371, based out of Marine Corps Air Station Yuma, perform shooting drills with their M16A4 service rifles during a squadron field exercise at the U.S. Army Yuma Proving Ground training facility in Yuma, Ariz., Wednesday, March 9, 2016.