U.S. Navy Aviation Electrician's Mate 1st Class Nathan Williams, attached to Patrol Squadron (VP) 16, weighs a backpack before loading it onto a P-8A Poseidon aircraft Nov. 29, 2013, at Naval Air Station Jacksonville, Fla. The P-8A Poseidon maritime patrol aircraft, designed to replace the P-3 Orion aircraft, was sent on its first operational deployment in the Pacific in late 2013.