In this movie the German "Panzers" are actually US WWII M47 Patton tanks which went into production in 1951. The US tanks used were M24 Chaffee's, which was in service from 1943-1953, and first made it's "debut" in WWII during the end of 1944. Also, the "German" half-track in the movie that's damaged by a landmine is also a US vehicle, a M3A1.