A Soldier from 20th Special Forces Group, Army National Guard, performs a back roll entry into the water during training and re-certification at the U.S. Army Special Forces Underwater Operations School, June 22, 2014, in Key West, Fla. Even after their initial training to be part of Special Forces, Soldiers - known as Green Berets - must continue to attend schools and train just to maintain proficiency in their specialty skill sets, like combat diver. (Army National Guard photo by Staff Sgt. Adam Fischman, National Guard Bureau/Released)