Cpl. Callista Prill (center), a military policeman

Cpl. Callista Prill (center), a military policeman with the 220th Military Police Company, Colorado National Guard, fires an M2 .50 caliber machine gun at a joint range with Slovenian military policemen during Astral Knight 19 near Postojna, Slovenia, June 3, 2019. AK19 is a joint and multinational exercise that will involve Airmen, Soldiers and Sailors from the United States and service members from the Croatian, Italian, and Slovenian armed forces. The exercise is an integrated air and missile defense exercise where training will focus on conducting integrated air and missile defense of various terrains. (U.S. Army photo by Spc. Ethan Valetski)