Treaties and other international acts series. 2409. Criminal offenses. United States and Polish armed forces, agreement between United States and Poland, effected by exchange of notes signed Warsaw Aug. 5 and 20, 1946; entered into force Ang. 20, 1946, and amendment effected by exchanges of notes dated Warsaw Feb. 6 and Apr. 3 and 14. 1947; entered into force Apr. 14, 1947.