Sgt. Jonathan Temple, right, and Sgt. Manuel Soto Jr., left, motor transport operators with Motor Transport Company, Marine Wing Support Squadron (MWSS) 371, supervise a Marine firing an MK-19 grenade launcher at Yuma Proving Grounds, Ariz., June 16. Marines with MWSS-371 conducted crew-served weapons training with MK-19 grenade launchers and M2 .50-caliber machine guns mounted onto 7-ton trucks and Humvees to hone their skills and increase their readiness. (U.S. Marine Corps photo by Sgt. Brytani Wheeler/Released) - Sgt. Jonathan Temple, right, and Sgt. Manuel Soto Jr., left, motor transport operators with Motor Transport Company, Marine Wing Support Squadron (MWSS) 371, supervise a Marine firing an MK-19 grenade launcher at Yuma Proving Grounds, Ariz., June 16. Marines with MWSS-371 conducted crew-served weapons training with MK-19 grenade launchers and M2 .50-caliber machine guns mounted onto 7-ton trucks and Humvees to hone their skills and increase their readiness. (U.S. Marine Corps photo by Sgt. Brytani Wheeler/Released)

Incoming Marine Fighter Attack Squadron 121 commanding officer, Lt. Col. James Bardo, recieves the squadron colors from outgoing commanding officer, Lt. Col. Steve Gillette, during the squadron's change of command ceremony aboard Marine Corps Air Station Yuma, Arizona, Friday, Aug. 14, 2015. The passing of the colors is the ceremony's most solemn moment, signifying the physical transfer of command from one Marine to the other. - Incoming Marine Fighter Attack Squadron 121 commanding officer, Lt. Col. James Bardo, recieves the squadron colors from outgoing commanding officer, Lt. Col. Steve Gillette, during the squadron's change of command ceremony aboard Marine Corps Air Station Yuma, Arizona, Friday, Aug. 14, 2015. The passing of the colors is the ceremony's most solemn moment, signifying the physical transfer of command from one Marine to the other.

Col. Christopher A. McPhillips (left), former commanding officer of Marine Aircraft Group (MAG) 13, and Col. Marcus B. Annibale, commanding officer of MAG-13, stand at attention during a change of command ceremony aboard Marine Corps Air Station Yuma, Arizona, July 31. McPhillips relinquished command to Annibale after serving as the MAG-13 commanding officer for two years. - Col. Christopher A. McPhillips (left), former commanding officer of Marine Aircraft Group (MAG) 13, and Col. Marcus B. Annibale, commanding officer of MAG-13, stand at attention during a change of command ceremony aboard Marine Corps Air Station Yuma, Arizona, July 31. McPhillips relinquished command to Annibale after serving as the MAG-13 commanding officer for two years.