U.S. Marines with Marine Medium Helicopter Squadron (HMM) 364, Marine Aircraft Group 39, 3rd Marine Aircraft Wing (MAW), prepare CH-46E Sea Knight helicopters for flight at Camp Pendleton, Calif., March 31, 2014. After 47 years of flying the CH-46, HMM-364, "Flies the Barn", taking off and landing in unison and flying in mass formations, signifying the transition to the MV-22 Osprey. (U.S. Marine Corps photo by Sgt. Keonaona C. Paulo, 3rd MAW Combat Camera/Released)