Chopper re 'TR-3B' - the rumours at the time were for a 'TR-3' or 'TR-3A' (and the name Black Manta connected). To this day, it's still believed that the designation came about from distilled conversation regarding Lockheed's Tier 3 UAV.
GR4techie - re sat recon of Groom Lake, 'scoot and hide' taxi-through shelters were eventually built to deal with the problem
Cheers
Norma