The jet plane seems to have wing root intakes, looks vaguely late 40s/very early 50s in style.
To me it looks more like the studio rang up the prop shop "we need some missiles and a jet aircraft" and got some generic stuff back. Even the V-1 doesn't look accurate. The tank I assume in an M-47/M-49, again no idea exactly how accurate it is. They couldn't even get a genuine Grasshoper for Lt. Col Kiley to fly around in, instead he gets a Bird Dog.
Since they used M-48s in the movie for the German tanks, would make sense to have a model of the same.
Now if they had only cranked out a hundred or so Tigers as the T-34 was modified to look like in "Kelly's Heroes"! As a kid, I thought it was a real Tiger....
Enjoy the Day! Mark