Given that the Great Highland Bagpipe (GHB) is a Scottish instrument, not Irish, I'm not really surprised there weren't any. (At least not officially. There may have been one or two pipers here & there along the route - in Boston &/or DC - that played, but the TV didn't pick them up.)

He was a few years before my time, but I understand that JFK was the one who was a fan of the pipes, which is one reason why the US Air Force Pipe Band was asked/allowed (?) to play at the interment, in addition to members of the Black Watch Pipe Band, who had just been in DC a few weeks earlier. I don't know if other members of the family were aficionados of the GHB or not.