not to steal rockys thread, those are 2.75" rocket launchers. came with various explosive heads, the most popular being white phosphours with flechettes.
buy the way rocky, did you ever stop in at phu cat for fuel and a reload in '67 or '68? it was my load crews and i's honor to load that aircraft with rockets and send it off on it's way.
gave it the whole schmear, stray volt check and all. and loaded it up with rockets. we weren't used to working on prop jobs. sure gave them a wide birth. we were all flabbergasted at that aircraft.
what a neat little machine.