People can be cruel with callsigns - there was a chap in the RAF many years ago who had a slight stammer and struggled with words beginning with F - he was given the callsign of 44Foxtrot on the Tac net. FFFFFFFFFF........
Ah yes, the tac c/s. There are a couple which stick in the mind: "22" (because its a small bore) and "Hansel & Gretel" ( who got lost in the woods)