I'm a grunt, but it wasn't all that intensive given the fact that I was sent to work with an artillery unit for base security. I just found myself working 18 hour days and got burned out of walking a mile up and a mile back from the chow hall for every meal plus midrats.
That and I fell into a depression when i lost my squad on a trumped up hazing charge. Apparently artillery reservists and active duty infantrymen have different ideas as to what the Marine Corps is. It is also kind of funny how both Marines involved didn't think they were being hazed, just the corporal whom I was about to relieve as team leader for losing his bearing during a rocket attack in front of his men, as well as leaving a radio with crypto alone around a bunch of civilians. It is also funny that the guy who got my job happened to be said corporal's only friend. I'm still a little bitter if you can't tell. Pretty much why I left the unit. I'll never work with pogues again.