U.S. Army Maj. Christopher Fields (center), commander of the 690th Rapid Port Opening Element, briefs incoming soldiers who will support a Joint Task Force-Port Opening exercise known as Operation Lone Oak at Volk Field, Wis., June 7, 2021. The soldiers are from Fort Eustis, Va., which is home to the Army’s three RPOE units. (U.S. Air National Guard photo by Senior Master Sgt. Vicky Spesard)