You and your son should be very proud. I am a Vietnam veteran, was in the Army. To me, the Marines, Army Rangers, Seals, all are very professional by training. By comparison, we were pretty much "rag tag" with 8 weeks of Basic Training and some form of AIT (Advanced Infantry Training), which was really schooling for our particular MOS (Military Occupation Specialty). Regardless of MOS, when we got to Vietnam, we were stuffed into whatever was needed, usually ending up out on patrol somewhere.
But these Ranger guys, they have training far beyond anything I ever went through and are therefore much better prepared for the jobs they will have to do. Big difference between the professional soldier and the rest of us (at least back then).
Tony