Project E was a joint project between the United States and the United Kingdom during the cold war to provide nuclear weapons to the British Royal Air Force (RAF) prior to Britain's own nuclear weapons becoming available. Later sometimes used more widely to refer to similar arrangements for the British Army of the Rhine. President Dwight D. Eisenhower stated: To this purpose, discussions were held around the use of Mk 15 thermonuclear weapons but no evidence of these actually being carried on British V bombers exists.