Boeing B-52 Stratofortress B-52D

The B-52D was a dedicated long-range bomber without a reconnaissance option. The "Big Belly" modification let it carry heavy loads of conventional bombs for carpet bombing over Vietnam, while the "Rivet Rambler" modification added Phase V electronic countermeasures systems, better than those on most later B-52s. Because of these upgrades and its long range, the D model was used more extensively in Vietnam than any other. Aircraft assigned to Vietnam wore a camouflage scheme with black bellies to defeat searchlights. 170 were built, with the same 47 kN-rated Pratt & Whitney J57 engines.