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.

drill instructor blows whistle] These recruits are 36 hours away from officially becoming United States Marines ... during their final challenge of boot camp, a 54-hour gauntlet called the ...

Brooklier, 29, enlisted in the Marine Corps in January ... Toward the end of boot camp, Brooklier finally got to do the ...

Narrator: This is Marine Corps boot camp in Parris Island ... Narrator: Recruit training culminates in an event known as the Crucible. Over the course of 54 hours, with minimal sleep and food ...