For a short time during 1970, a VNAF squadron had H-34's staging out of Quan Loi. They were located across the runway from our unit. I'm guessing, but they may have operated across the "red line" into Cambodia when such activity was unfashionable. They lacked national markings and were camoflaged in a light green/black or black-green mottle. I believe I have a photo in my collection. Will try to find it and send a scan. Shortly after the Cambodian Incursion (May 1 to June 30, 1970) they left and I never saw them again. The U.S. Army called them Choctaws, the Navy and Marines called them Seabats and Seahorses. Some of their pilots called them "Shuddering XXXXhouses".
Check out Schiffer Military History book on the H-34. It is loaded with color and b/w photos. It may be available through Greatmodels.Com. Squadron Signal also has an "In Action" series piece on the H-34.
I could be wrong (that's never happened before), but I think "Kingbee" was the
call-sign of the VNAF squadrons or one of the squadrons which operated the H-34. I think the "Kingbee" name may have been a generic term which became associated with the aircraft.