At many years' distance, I think Spare Looter 7 was the 20TASS
radio room at Danang, Spare Looter 13 was the 20TASS FOL at Pleiku, and I
believe that there was a Spare Looter 11 and that it was at Tan Son Nhut.
The links were used for mission reporting and 20TASS operational traffic.

Jim Gordon