The origins of the Five Eyes alliance can be traced back to the Atlantic Charter, which was issued in August 1941 to lay out the Allied goals for the post-war world. On 17 May 1943, the British–U.S. Communication Intelligence Agreement, also known as the BRUSA Agreement, was signed by the UK and U.S. governments to facilitate co-operation between the U.S. War Department and the British Government Code and Cypher School (GC&CS). On 5 March 1946, the secret treaty was formalized as the UKUSA Agreement, which forms the basis for all signal intelligence cooperation between the NSA and GCHQ to this day.[13][14]