"Wow, I'm glad someone mentioned the Bearcat so I didn't have to risk being a fool...
Anyhow, it is my understanding that the F8F bearcat is the fastest non-jet aircraft ever produced and I'm glad I wasn't alone."
Rarebear, as impressive as it is, doesn't represent a military aircraft. It certainly hasn't been built in any substantial quantity. Military-spec F8F's were known more for their outstanding climbing ability than for maximum true level speed.
J_A_B