I don't know how relevant this would be now, but in my day the Corps put everybody through basic....16 weeks at that time....the physical standards were met, everyone had weapons training, military ethos stuff, etc. . During the period everybody was assessed and asked what they preferred. NO ONE had a guarantee, only that their wish would be granted if the assessment agreed.
I, obviously full of piss and vinegar, wanted to be a grunt, in the worst way. After all the tests, they assigned me to be a ground radio technician. I requested mast all the way up to General Hockmouth (?), the then CO of MCRD San Diego. All he would promise me is that upon completion of my electronics training I would be guaranteed orders to FMF PAC ( Viet Nam), as a ground radio technician.
I later found out ways to be the grunt I always aspired to, but that came with experience of the system.
What I am pointing out is that everybody was assigned "to the benefit of the Corps", not somebody's vision of being John Wayne II...