Marine Corps Sgt. Chesty XIII, right, official mascot of the U.S. Marine Corps, stares down his successor, Recruit Chesty, during training on Marine Barracks Washington in Washington, D.C., March 20, 2013. Marine Corps Sgt. Chesty XIII, right, official mascot of the U.S. Marine Corps, stares down his successor, Recruit Chesty, during training on Marine Barracks Washington in Washington, D.C., March 20, 2013. SHARE: Download: Full Size (0.53 MB) Tags: Photo Essays, Week In Photos, Week In Photos Credit: VIRIN: 036676-F-VNI19-937.jpg Photo Gallery