U.S. Army 1st Sgt. Christopher Green, 74th Engineer Detachment (Dive), 30th Engineer Battalion, 20th Engineer Brigade first sergeant, briefs a dive team before a training scenario at Fort Eustis, Va., March 12, 2014. Divers go through two phases of training before being assigned to a unit. (U.S. Air Force photo by Senior Airman Austin Harvill/Released)