What is the hardest obstacle at Marine Corps Boot Camp?

Surviving the 13 week scream-a-thon. Its hard on the eardrums.

Nothing hard about the obstacle course.

As soon as you get off the bus and meet your DI!

the crucible is the hardest obstacl its 54 hours long and you get very little sleep and its mostly mentally challenging

i agree with the other guys. im not a marine but i have been in a few military style bootcamp summercamps. and we did the "the tough one" which isnt very tough but its fun. jacobs latter which is a huge 100 foot latter where the wrungs are 6 or 7 feet apart, thats my favorite one. and several others. there not really scary at all there just like large jungle gyms.