I don't think anybody, actor or marine, is ever going to enjoy boot camp. It certainly wasn't at all enjoyable. Informative and educational, yes, but it was pretty tortuous.
My grandfather was in World War II and fought in Europe in Army Infantry, so I have such a huge respect for him, and he's shared some personal experiences with me.
I try to leave my work at work, and check my work-baggage at the door before I go outside of here. I'm not a super method actor, and I think that all the answers are inside the script.
In my grandfather's day, there was a different perspective on war and men that went into war; it was such a patriotic act to fight for your country in the Forties.