Truly "back in the day" sh!t there, BD1. My battalion at Sill was a test-bed for TACFIRE but we didn't field it into the FA brigades before about 1979-80. Whole bunch of stuff showed up between 1980-85. Digital Message Devices, VHF encryption gear, Laser designators, TACFIRE and, yeah, AN/TPQ 36/37 radar.
Both videos were early/mid 70s with the TACFIRE video relying heavily on Vietnam era footage. Early Vietnam at that judging by the prominent unit shoulder patches for the 101st Airborne.