I though the huey was, too, but a but of study of its fleeting appearances, its a flying blood bottle, which could look like a huey. Dad was navy during that time, and between the stories he knew and the ones he heard and the stories i had read, the early years had a lot of vaguely recogniseable story plots. I first noticed this when i started casually watching the reruns (never saw an original) and iirc there
were 2 story elements from the book Chesty, which i thought was in was ww2, and asked dad about a few storyplot details, and he started watching too. The later the series got, the more snidely anti-war they got. They went from war can be a farce, to war is an evil fraud.
Hogans heroes was at least acknowledged as fantasy, warped...er...wrapped... around elements of reality. Most of those actors were legit war heroes, whether medalled or tattooed or exiled during the events they so delightfully spoofed. Not so with mash, a bunch of anti-2A posers.
Always fun to spot the old cars, trucks, guns, and o.o.p.a.s, whether mash or HoHe's. Chips was always hey, there's a (some car or other), and wow, they badly faked that prop or set...
"Suspend diebelief, all ye who watch"
Or, shatner, comes to mind; "it's, just, a tv show! Get, a life!"