ALEUTIAN ISLANDS: The Eleventh Air Force dispatches 30 P-40s, 17 P-38 Lightnings, 9 B-24 Liberators and 6 B-25 Mitchells to fly 10 missions to Kiska Island, bombing and strafing the runway, North Head area, installations, parked seaplanes, and facilities on Little Kiska.
BURMA: Tenth Air Force P-40s dropping 1,000 pound (454 kg) bombs, hit airfields at Myitkyina and Manywet, rendering the runways at both unusable.
CHINA: Fourteenth Air Force P-40s strafe pack horses south of Tengchung, barracks and warehouses in Lungling, and cattle and trucks north of Lungling.
NEW GUINEA: Fifth Air Force B-17s, B-24s and B-25s carry out widespread attacks on individual enemy vessels. During these raids, B-17s bombing Hansa Bay sink an army cargo ship.
An estimated 144 Japanese bombers and fighters carry out a heavy attack on the Milne Bay area, severely damaging 1 vessel, beaching 1 vessel, and hitting 2 others, but doing very little damage to USAAF facilities in the area. AA defenses and the 40+ P-40s and P-38s that intercept the enemy strike shoot down 7 aircraft with the loss of three US fighters.
Captain Richard I "Dick" Bong becomes a Double Ace when he gets his 10th kill, one of the Mitsubishi G4M, Navy Type 1 Attack Bombers (Allied Code Name "Betty") attacking the Milne Bay area.
HMAS Wagga, a minesweeper, with HMA ships Kapunda and Whyalla, took part in the defense of Milne Bay during a heavy Japanese air attack.
The British vessel "Gorgan" was damaged and the Netherlands troopship "Van Heemskerk" was hit by bombs and set on fire. Minutes before the fire reached drums of petrol, which blew up, the Wagga took the survivors off the ship and saved a lot of lives in doing so. The ship was beached, but became a total loss. The Wagga sustained superficial damage.
U.S.: John Grist Brainerd, director of research at the University of Pennsylvania' s Moore School, submits a proposal for an electronic computer to colleagues at the U.S. Army's Ballistics Research Laboratory. The proposal was written by the Moore School's John Mauchly. In May 1943, the Army contracted the Moore School to build ENIAC, the first electronic computer. Although ENIAC was not finished until after the war had ended, it nevertheless marked a major step forward in computing.
The USAAF activates the Weather Wing at Asheville, North Carolina to provide scientific weather information for the USAAF and the rest of the Army. This new wing assumes responsibility from HQ USAAF for the supervision of the Army Air Forces Weather Service which was established in 1937.