We Make Marines,” proclaims a banner at Marine Corps Recruit Depot Parris Island, South Carolina, summarizing the service’s ethos that recruits have to prove they have the mental and physical toughness to serve in the Corps by surviving boot camp. By the time men and women receive their Eagle, Globe, and Anchor, they have proven that they have the physical and mental toughness to earn the coveted title of “Marine.”But Marine Corps Commandant Gen. David Berger wants “exceptionally talented Americans” to be able to bypass the Corps’ traditional rites of passage and begin serving “at a rank appropriate to their...