But spokesmen for the National Guard and Texas Air National Guard said it was impossible to trace the machines that Colonel Killian's unit, the 111th Fighter Intercept Squadron, or any unit, used so long.
Forget the machine, this was a military organization, they thrive on paperwork. Look for other documentation produced by Colonel Killian around the same time period and see if the documents match up.
The FOIA should be able to produce tons of documentation.