Treadigraph, all KC-135s have been re-engined (at least the ones still flying) so I don't think water injection is still a thing for that aircraft.
Compass - at least the engines I was familiar with, injection occurred mid-compressor. Cooling the incoming air has an additional advantage of improving compressor performance while lowering the peak EGT so you don't melt the turbine.
Last edited by tdracer; 15th Nov 2022 at 23:00.