Maj. Gen. Daniel O’Donohue, commanding general of 1st Marine Division, speaks about Marine Aircraft Group (MAG) 39 and 1st MARDIV’s integration during an award ceremony at Marine Corps Air Station Camp Pendleton, Calif., May 15. 1st MARDIV recognized MAG-39 as an honorary member for continuing to support the ground Marines and constantly working toward more advanced MAGTF integration. (U.S. Marine Corps photo by Lance Cpl. Jake M.T. McClung/Released) - Maj. Gen. Daniel O’Donohue, commanding general of 1st Marine Division, speaks about Marine Aircraft Group (MAG) 39 and 1st MARDIV’s integration during an award ceremony at Marine Corps Air Station Camp Pendleton, Calif., May 15. 1st MARDIV recognized MAG-39 as an honorary member for continuing to support the ground Marines and constantly working toward more advanced MAGTF integration. (U.S. Marine Corps photo by Lance Cpl. Jake M.T. McClung/Released)

U.S. Marines with Marine Medium Helicopter Squadron (HMM) 364, Marine Aircraft Group 39, 3rd Marine Aircraft Wing (MAW), fly CH-46E Sea Knight helicopters over San Diego, 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) - U.S. Marines with Marine Medium Helicopter Squadron (HMM) 364, Marine Aircraft Group 39, 3rd Marine Aircraft Wing (MAW), fly CH-46E Sea Knight helicopters over San Diego, 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)