Are you sure its OPIS? The new airport doesnt has so much skid marks on the ramp and there's mountains in the backdrop of OPIS,in the posted pictures I dont see any mountains.Plus I am not even sure if OPIS can support fighters yet.Maybe its Chaklala.
And a fighter squadron departing from OPIS for the exercise makes no sense to me.Not forgetting the squadron participating is from Quetta,so there pit stop would be Kamra.
Pakistani C130s are being upgraded to modern standards by some foreign compnay, there's a thread on PDF about that I think.