I mean

"from a philosophical/psychological/physiological pov i think of them as sharing a lot of the characteristics of hardcore monks/yogis."

"warriors do not have the same goals as monks," "he is adapting their practices to his station in life."

So what philosphical qualities do they share? All I could glean from your comments is some idea of "egolessness" but if all you are referring with this is discipline, detachment, following orders, mental fortitude, then these submariners are really a lot less special than you made them seem initially.

A burglar and a locksmith share techniques, nobody would claim they share a philosophy.