Some of the best alternate uniforms we've seen in recent years have come from the service academies. After all, there's just so much material there.
There was this picture-perfect alternate look from Navy:
And this fleet of alternate lids:

Army has also busted out its camo-fatigue themed uniforms to much success:

Joining that group is this new helmet Air Force debuted on Sunday. These lids, which will remind some of a certain age of Ice Man, Maverick and "Top Gun" -- and, yes, we know they were in the Navy, but roll with me here -- are dubbed the Falcons' "Sharktooth" helmets.
Air Force will wear these helmets for the first, and hopefully not the last, Sept. 10 against Georgia State. Update:


