Psychological Warfare Branch (1944 – 1945) was a psychological warfare unit within the U.S. Army that operated in the closing months of the Pacific War against Japan. Similar to the Psychological Warfare Division in the European Theater, the PWB mostly produced leaflets to be dropped in large numbers from airplanes that were meant to demoralize the enemy, encouraging them to surrender, and to provide information on Allied victories to civilians. These efforts were influential on the development of psyops in the early Cold War, including their widespread employment during the Korean War.