I think was during WWII, Kinnick hosted the "Iowa pre-Flight Seahawks" football team during '42, '43 and '44 seasons, as we were a naval conscription school. They were actually bosses, finishing 7-3, 9-1 (#2 in the nation) and 9-1 (#6 in the nation). Their star player in 1942? None other than Forest Evashevski.
My guess is that those were the Pre-flight naval barracks.
The Quonset huts and similar barracks-style structures were at a number of locations around campus at least through the '70's. When I was there in the '70's they were used for married student housing.
wonder what the housing is in that first picture - west of the stadium. almost looks like barracks of some kind.