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.

U.S. Marine recruits push through a combat endurance course at Parris Island, South Carolina. The course is part of Recruit Training, Basic Warrior Training, which teaches recruits basic field-related ...