only alphas become spess merines
DAMN, they have to be aggressive, loyal, intelligent and with superior body
even then, they will be push into trails, hard (deadly) training and then the awful modifications
if they survive, they will get bald and huge. they will fight er'day, until they are killed or destroyed, if they are lucky, they will be put in a mechanized sarcophagus with flamethrowers and shit, and you will be fighting for eternity until your enemy could evaporate you or some shit
the only problem it's they will be perma virgins and die virgins, I don't know if they are able to fap or if gay sex is allowed between the Chapters