Dec 3 on 13312 USB I logged GVT clg AF9 in ALE followed by “Aircraft 29 Thousand” and “Foxtrot” for radio checks.
I just received this note from Larry Van Horn who informs me:
AF9 USAF VC-25A 89AW/1AS Joint Base Andrews, MD #92-9000: Selcal AE-MP
GVT Civilian Contractor E-Systems Test Facility/Raytheon Greenville, TX L-3
Multi Sensor Test Facility (MSTF)
If this is the case then what a thrilling catch!