U.S. planes continue heavy raids in South Vietnam and claim to have killed 580 guerrillas. U.S. Phantom jets, escorting fighter-bombers in a raid on the Yen Sen ammunition depot northwest of Hanoi, engaged North Vietnamese MiG-17s. Capt. Thomas S. Roberts with his backseater Capt. Ronald C. Anderson, and Capt. Kenneth E. Holcombe and his backseater Capt. Arthur C. Clark shot down two MiG-17s with Sidewinder missiles. The action marked the first U.S. Air Force air-to-air victories of the Vietnam War.