I'm well aware of the UHF (DME) abilities of TACAN.
I'm also aware that 901 never interrogated the McMurdo TACAN. There was a whopping great mountain in the way...
(p.s you are aware that the reason civil aircraft can't interrogate bearing information off a TACAN is because TACAN is UHF, and NDBs and VORs operate on VHF, aren't you? The reason civil aircraft can get range information off a TACAN is because DME is UHF, as is TACAN..)