Starfleet Spartan.........That has huge potential. not an ODST......that is too military looking. Starfleet is more exploratory rather than military.....or should be. Just imagine how boring a series would be if there were no conflict and just exploring things and planets.......That's why they have battles with....whomever. So which Spartan suit is least military looking but would be worthy of Starfleet?.........I would say that the 3 most non-military looking are:
Recruit
Warrior
Air Assault
How ever the helmets visors of these suits are smallish, that is to protect the wearer....in all of the Star Trek films, the EVA suits had large visors.....obviously to see the actors face on film....so you need a helmet w/ a large visor.......ergo, the EVA helmet......just not w/ the scratches like Emile's.