[commish]

C-5 engines have a very distinctive high-pitched whine/whistle that no other plane in the inventory has.

Another distinctive sound is the KC-135 when it is using the water-injection system on takeoff -- they will shake the entire flight line area as they take off, plus leave a trail of black smoke down the runway that is amazing looking.

[dighton]

C-5 engines have a very distinctive high-pitched whine/whistle . . .

Good example here.

[TankerKC]

The KC-135A & B-52G's both used the "steam jets." During exercises we would launch all aircraft in minimum interval takeoffs (MITO). What a display!