Teamwork seems to be the focus of boot camp although one starts hearing over and over again the words "Marines boot camp will tear down and rebuild the recruit while weeding out the undesirable recruits thereby leaving only the best to earn the name Marine."
I feel like teamwork is probably the foundation of being a Marine. Starting with the drill instructors and their behavior, the recruits are given a common enemy and a reason to work together.
Drill instructors "almost certainly be the most sadistic, maniacal tyrants you have ever met," but they are also all special duty volunteers for the job and "off duty they are kind hearted, honorable men and women who want to do the best they possibly can to help insure that you come home safe should you be deployed to a combat zone."
I liked this video/slide show a lot because it has some great images and probably captures the life of Recruit very well.
"Marines are about the most peculiar breed of human beings I have ever witnessed. They treat their service as if it were some kind of cult, plastering their emblem on almost everything they own, making themselves up to look like insane fanatics with haircuts to ungentlemanly lengths, worshipping their Commandant almost as if he were a god, and making weird animal noises like a band of savages. They'll fight like rabid dogs at the drop of a hat just for the sake of a little action, and are the cockiest sons of bitches I have ever known. Most have the foulest mouths and drink well beyond man's normal limits, but their high spirits and sense of brotherhood set them apart and, generally speaking, the United States Marines I've come in contact with are the most professional soldiers and the finest men I have ever had the pleasure to meet."--An Anonymous Canadian Citizen