U.S. Air Force Maj. Mike Renna, 351st Air Refueling Squadron aircraft commander, briefs his crew on their mission at RAF Mildenhall, England, April 24, 2019. During Mission Assurance Exercise 19-01, Airmen tested their ability to survive and operate in wartime conditions, as well as showcased their ability to generate combat airpower in a wide range of environments and scenarios. (U.S. Air Force photo by Senior Airman Benjamin Cooper)