2 of 4 CFM International F-108-CF-201 turbofan engines, 22,000 lb (96 kN) each on RC-135U Combat Sent, at Aviation Nation, Nellis AFB, Nevada.
The RC-135U Combat Sent is designed to collect technical intelligence on adversary radar emitter systems. Combat Sent data is collected to develop new or upgraded radar warning receivers, jammers, decoys, anti-radiation missiles, and training simulators.
Distinctly identified by the antennae arrays on the nose, tail, and wing tips, three RC-135C aircraft were converted to RC-135U (63-9792, 64-14847, & 64-14849) in the early 1970s and 63-9792 was converted to Rivet Joint, late 1978, and all aircraft are based at based at Offutt AFB, Nebraska. Minimum crew requirements are 2 pilots, 2 navigators, 3 systems engineers, 10 electronic warfare officers, and 6 area specialists.