We got an inside look at the United States Marine Corps' intense 13-week basic training program in San Diego, California.

After four years in the Army, Nicolas Brooklier wasn't sure what to do next. Brooklier, who had served as a transportation and logistics officer and attained the rank of captain, mulled getting ...

Narrator: This Marine Corps recruit isn't actually injured ... Narrator: It's part of their final test at boot camp, known as the Crucible, a 54-hour event that all recruits must complete.

Recruit: Aye, aye, sir! Aye, aye, sir! Aye, aye, sir! Aye, aye, sir! Narrator: This is Marine Corps boot camp in Parris Island, South Carolina. Before they become United States Marines ...