Can't be real. All those vehicles were way too dirty.
My next door neighbor was there around that time. He was an instructor at Hohenfehls especially during the M48 to M60 transition. I based my M48A2 build on footage like this, even marked it for fourth armored.
By the way, if you blink you will miss it, but there was a brand new M60A1 in one cut away scene. You could see the flat turret side and angled nose. Very brief but it was there.
And you know that upcoming Afv-club M113 with all those included M14 rifles would be perfect to do one of the ones in the footage there.