[Radoye]

If a baloon can be given a flight model, it could be used as a USN blimp, i guess.
They were actually used in the war. Other than that, I don't think there were many zeps flying around in WW2

US Navy operated two Akorn and Macon, but they were gone by 1935, both were lost in accidents. These had special parasite fighters developed for them and would indeed be a cool addition for what-if scenarios.