Seems B71 is being very selective in his examples.
Many times additional gun teams were allocated by the US Army, to supplement the daily LFT they based at Nui Dat. (mainly from Bein Hoa) These "opportunity" LFT's did sometimes come from "far away", but they were a "bonus" addition that we were grateful for.
They weren't the regular or main taskers that B71 likes to infer they were.