180911-N-LQ867-003 JACKSONVILLE, Fla. (Sept. 11, 2018) Aviation Machinist’s Mate 2nd Class John Curwick signals the control room during the final testing of a T-56 engine at Fleet Readiness Center Southeast Detachment Jacksonville. The detachment’s engine and power plants division, known as the "400 Division," has been testing the venerable turboprops since 2002. (U.S. Navy photo by Clifford Davis/Released)