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 ...

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 ...

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.

My brothers and cousins give me hell for not touching the top piece of wood, I'm just desperately trying not to fall. On the drive out I notice a bunch of recruits in the sand pit doing pushups ...