In an image taken from video, Ethan Arguello, a former Marine drill instructor, and Sgt. Maj. Paul Archie, the senior-enlisted adviser at Marine Corps Recruit Depot Parris Island, get in a verbal argument. (YouTube video screen grab)Gen. Joseph Dunford salutes during the passage of command ceremony at the Marine Barracks in Washington Oct. 17, 2014. Dunford relieved Gen. James Amos to become the commandant of the Marine Corps during the ceremony. (U.S. Coast Guard photo by Petty Officer 2nd Class Patrick Kelley)Sergeant Major of the Army Raymond F. Chandler, Master Chief Petty Officer of the Navy Michael D. Stevens, Sergeant Major of the Marine Corps Micheal P. Barrett, and Chief Master Sergeant of the Air Force James A. Cody, testify before the Senate Subcommittee on Personnel at the Russell Senate Office Building in Washington, D.C., on April 9, 2014. (U.S. Marine Corps photo by Sgt. Marionne T. Mangrum)U.S. Marine Brig. Gen. Daniel D. Yoo, Regional Command (Southwest) (RC(SW)) commanding general, gives a thumbs up as he and Sgt. Maj. Douglas E. Berry, RC(SW) SgtMaj, send off Marines to board a KC-130 Hercules aircraft to depart the Bastion-Leatherneck Complex in Helmand province, Afghanistan October 27, 2014. The Marines departed following the end of RC(SW) operations in Helmand province. (Official U.S. Marine Corps photo by CWO3 Benn Barr/Released)Cpl. Robert Richards, a scout sniper, and his wife Raechel Richards at home in Jacksonville, N.C., on Wednesday, September 11, 2013. Richards, then a sergeant in 3rd Battalion, 2nd Marines, was implicated in a video of Marines urinating on Taliban corpses and pleaded guilty in summary court-martial to to failing to obey a lawful order and violating Article 134 of the Uniform Code of Military Justice. (Mike Morones/Staff)