Empty 7.62mm casings fall inside the cab of a humvee as a security forces specialist assigned to the 180th Fighter Wing, Ohio Air National Guard, fires a crew-served weapon April 12, 2017, at the Fort Custer Training Center in Battle Creek, Michigan. Continuous training keeps Airmen ready to deploy and allows the to be the most lethal choice for the combatant commander, increasing overall force capability. (U.S. Air National Guard photo by Staff Sgt. Shane Hughes)