The WS-125 was a proposed super long range bomber, designed by the United States during the cold war. It was supposed to be a nuclear aircraft and was scheduled to be named as B-72.
In 1954, the USAF issued a weapons system requirement for a nuclear-powered bomber, designated WS-125. In 1956, GE teamed up with Convair (X211 program) and Pratt & Whitney with Lockheed in competitive engine/airframe development to address the requirement.
In 1956, the USAF decided that the proposed WS-125 bomber was unfeasible as an operational strategic aircraft. Finally, after spending more than 1 billion dollars, the project was canceled on March 28, 1961.