There does seem to be a significant hole for a scifi warband/platoon sized game. Especially one that lets you tailor your own forces ala Lion/Dragon Rampant. Theres Agis's rulebook (forgitten the name off hand), but that lacks the truely alien and space opera, then theres tomorrow's war which lack the fore mentioned even more and is bogged down by some, in my eyes, clunky mechanics. Apart from really old school like Rogue Trader, Stargrunt, etc I dont see all that much around tbh.