I'd like to add one thing to this thread that may be lost on a lot of folks that are not or have never been in the military:
First, the US Army has the Army Special Forces Command headquartered at Ft. Bragg; the US Air Force has the Air Force Special Operations Command headquartered at Hurlburt Field, and; the US Navy has the Navy Special Warfare Command headquartered at Naval Amphibious Base Coronado -- however, even though the US Marine Corps has the United States Marine Corps Forces Special Operations Command (MARSOC) as it's integration point for the United States Special Operations Command (SOCOM), the entire Marine Corps is in essence an entire force made up of Special Forces/Special Operations/Special Warfare as a whole.
Second, as a combat medic I have treated a number of Marines in my time, and although some of them may have been blown to hell by shrapnel at times, their gunshot wounds from the enemy were always in the front. If you're not sure what that means, ask a Marine.
I never met a Marine that I couldn't rely upon in combat, nor that I didn't feel comfortable and safe having them cover my six. (Now, off duty, and drunk... that's a whole other story that I won't get into here)
If they can come up with a slogan that can relay that, then they may have another good one like "the few, the proud."