Aviation Machinist’s Mate 3rd Class Martin Harris, left, native of Battle Mountain, Nev., and Aviation Machinist’s Mate 2nd Class Joel Diones, right, native of Los Angeles, both assigned to the “Black Jacks” of Helicopter Sea Combat Squadron (HSC) 21, perform maintenance on an MH-60S Seahawk helicopter. HSC-21 provides combat-ready aircraft and personnel to deploy in support of the Navy’s national security strategy. (U.S. Navy photo by Mass Communication Specialist 3rd Class Derek A. Harkins/Released)