I had seen a shorter version of it. But this one is more complete. Interesting use of the rockets as AT mine and as fougasses. On top, some M5 Light tanks pretending to be German tanks get blown up.
I watched another film on how to deal with enemy tanks (yes AT rifle grenades) and the film crew had done a decent welding job on some M3 mediums to make them look like something that might be mistaken for a panzer on a very dark night.