Add Yahoo as a preferred source to see more of our stories on Google. Pfc. Vallen Grayson lost more than 100 pounds over two years to meet the Marine Corps’ enlistment standards. (Sgt. Jose Cruz/U.S.

While Marine Corps Recruit Depot Parris Island and San Diego operate under the same training curriculum, the same Crucible, the same physical standards, and the same core values, the environments in ...