Eh, Magog sort of has something of a point - problem is that your average marine isn't Superman. Soldiering tactics are based around a unit of similar people, one or two of those perhaps having a useful additional ability. Superheroic teams like the JSA are filled with people of varying abilties, powers, and usefulness, a lot of whom are going to be acting in very different ways. On these pages, we've got Peej, Wildcat, Stargirl, Magog - all of their strengths lie in different areas. The closest you can come to some kind of unit tactics is simply having everyone focus on their own particular skills, meshing occasionally when useful - which, shock, is what they already do.
Saying marine experience qualifies one to be a superhero, even qualifies one as superior to many years of actual superheroics, is like saying martial arts training qualifies one to drive a tank. It's an entirely different type of fighting - when it is fighting, that is.