(pause here while I prepare to vent on a pet peeve)
I would venture that the biggest single distinction between the Marine Corps and the Army (except for the girlie boot camp thing) is that Marine brass does everything possible to instill a sense of warrior honor and tradition, while the Army brass does everything to quash it.
The Marine Corps dress unifrom is essentially unchanged since, well, since Christ was a lance coporal. The Army Dress uniform seems plagarized from the wait staff at the Plaza Hotel. Every stitch in the Marine Dress Blues means something, represents a fellow Marine who gave his all and is worn by a Marine who would do so today at a moment's call. What the Hell does the Army dress uniform stand for?
The combat arms of the United States Army have a tradition as rich with valor as any force on earth, but the brass seems embarrassed about it. My dad was a combat infantry officer in the Big Red One in North Africa (wherein he learned something about dealing with recalcitrant Arab allies). Instead of drilling the traditions of a victorious warrior Army into today's recruits, the brass substitutes sensitivity training and bus drivers' uniforms. The sooner the brass to re-emphasizes the warrior tradition and restores a traditional uniform, ie: the one warn on VE Day, (OK, and does something about the girlie boot camp), the sooner we can all sleep better (and Osama can sleep eternally).
Semper Fi
They can't. A soldier like that might just shoot the shit out of Dan Rather if they crawled up on a beach to Dan's lights and cameras...