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

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 ...

But last week, those same teachers and instructors returned home from their own boot camp, with sore muscles ... home to one of the United States’ Marine Corps Recruit Depots.

We got an inside look at the United States Marine Corps ... female recruits are not allowed to talk to each other during training. In week seven, recruits travel 40 miles north of San Diego to ...