123 Ad-hoc Squadron is only a war time establishment. It is believe it was first activated for operations in Nagaland with use of machine gun and F24 aerial camera for Recce at Tezpur in 1962. The Sqn was activated again during the 1971 war with five T-6G/ Harvard aircraft (IT-283,  IT-309, IT-312, IT-373) from from AFA and FIS during the 1971 War. It operated from Sirsa till 6th December 1971 and thereafter at Rajouri ALG. The aircraft were painted Dark Green on surface and black on the underneath. They were rigged with Hunter electric boxes and carried 6 x T-10 rockets and did 13 ops sorties during the war.Pilots were  Gp Capt Weir, Sqn Ldr Ashok Oza, Sqn Ldr K B Singh, Flt Lt Barbara and Flt Lt  P R Suri. Two of the aircraft were flown back to AFA Dunidgal after the war, thus probably originated there.