Staff Sgt. Bradley Nendel, 380th Expeditionary Security Forces Squadron, performs an operational check on an M4 Carbine weapon at Al Dhafra Air Base, United Arab Emirates, March 8, 2019. The M4 is a lightweight, gas operated, air cooled, magazine fed, selective rate, shoulder fired weapon with a collapsible stock, and is now the standard issue firearm for most units in the U.S. military. (U.S. Air Force photo by Senior Airman Mya M. Crosby)