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: These Marine recruits are training on the rappel ... Rappel tower happens on day 25 of boot camp, a particularly busy day where recruits also train in the dreaded gas chamber.

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 ...

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 ...