Agreements between the United States of America and Belgium respecting mutual aid, including agreement relating to supplies and services, signed at Washington April 17, 1945, effective April 17, 1945; with memorandum of interpretation signed at Washington April 17, 1945, and exchanges of notes signed at Washington April 17 and 19 and May 19, 1945; and agreement relating to principles applying to the provision of aid to the armed forces of the United States, effected by exchange of notes signed at Washington April 17 and 19, 1945, effective June 16, 1942.