There is one technical aspect that would put a damper on his story. Civilian aircraft communicate on VHF and military use UHF. The Cessna and the Twin Beech pilot would hear each other but not the military pilots and like-wise for the military pilots not hearing the civilian aircraft. They all would hear the controller since he is broadcasting on both UHF and VHF.
The other unique feature is the controller is giving ground speed. His radar measures the distance the aircraft travels between sweeps and calculates the ground speed. The pilot's onboard airspeed indicator could be reading much different considering the effects of wind. The Cessna at 90 knots might have 125 on his airspeed indicator, so the ground speed lets him know he has a 35 knot headwind. Something important if he pushing his fuel limits. The same factors would apply for a tailwind, a different Cessna traveling in the opposite direction with an airspeed of 125 knots would indicate a ground speed of 160. Two identical aircraft both flying with the same airspeed yet arrive at their destinations in a much different length of time.
This is what the controller sees on his screen. Each aircraft is displayed with a tag, you would never see this many at one time. This indicator has every sector displayed. You would filter out the other aircraft that were above or below your sector or along side your sector. This would be a supervisor's view showing everything combined.
The aircraft's altitude is not calculated by the radar like speed, it's part of the aircraft's transponder being sent back to the ground. Each aircraft is given a discreet transponder code and once the pilot dials in the code, the radar's computer pickups the code and the tag is attached. Aircraft without an operating transponder would only show as a primary target, which is just a little blip with no tag. However, in most congested areas flying without a transponder is not allowed.
