AUSTRALIA: The USAAF's Air Transport Command activates two transport squadrons, one at Archerfield Aerodrome near Brisbane, Queensland, and the second at Essendon Aerodrome near Melbourne, Victoria. The squadrons are equipped with various transport aircraft.
BURMA: The Burma I Corps continues a northward withdrawal from the Allanmyo area although not under enemy pressure. In the Sittang Valley, Lieutenant General Joseph Stilwell, Commanding General American Army Forces, China, Burma and India and Chief of Staff of the Chinese Army, begins deploying the Chinese for a stand at Pyinmana. The Chinese 22d Division is to fall back gradually on Pyinmana, where the Chinese 96th Division is to take over.
Japanese bombers attack Mandalay, killing 2000 and destroying much of the city.
Six 10th Air Force B-17's from Asansol Airdrome, India, bomb warehouses and docks at Rangoon starting three large fires; one B-17 fails to return.
EAST INDIES: RAAF Hudsons of Nos. 2 and 13 Squadrons operating from Darwin, Northern Territory, Australia, bomb Penfui Airfield on Dutch West Timor Island. The Australians destroy four and damage two aircraft on the ground.
HAWAII: Admiral Chester W Nimitz assumes command of Pacific Ocean Areas (POA). POA comprises North, Central, Southeast and South Pacific Areas, all under overall command of Admiral Nimitz as Commander-in-Chief POA.
The Southeast Pacific Area had been established on 8 December 1941 and is commanded by Rear Admiral John F Shafroth. The South Pacific Area is officially established on 20 April and North Pacific Area on 17 May.
Nimitz retains his position as Commander in Chief Pacific Fleet (CINCPAC).
Light minelayers USS Pruitt, Preble, Sicard, and Tracy mine French Frigate Shoals, Hawaiian Group, to prevent Japanese submarines from using the area as a refueling point for flying boat raids on Oahu.
See my thread on airfields of the pacific to see what this atoll looks like
PHILIPPINE ISLANDS: The Japanese open an all-out offensive against the Bataan line, which is by now under strength, undernourished, poorly clothed and equipped, and battle weary.
After air and artillery bombardment, lasting from 1000 until 1500 hours, the Japanese move forward, making their main effort against Sector D, the west flank of the II Corps, where the 41st and 21st Divisions, Philippine Army (PA), are thinly spread and dazed as result of the preliminary bombardment. The 41st, on the west, gives way and is rendered virtually ineffective as a fighting force, although a regiment on extreme west succeeds in withdrawing in an orderly fashion.
A battalion on the flank of the 21st Division is forced to pull back. An effort to re-establish the line of the 41st Division after dark is partially successful. The only corps reserve unit, the 33d Infantry (PA), less the 1st Battalion, is released to Sector D as is the Provisional Tank Group (-) of the Luzon Force reserve. In the I Corps sector to the west, the Japanese succeed in reaching the main line of resistance on the eastern flank but are unable to pierce it.
(SWPA, 5th Air Force): 21st and 22d Transport Squadrons, Air Transport Command, US Army Forces in Australia, are activated at Archerfield and Essendon Airdrome, Australia respectively with various transport aircraft. 39th Pursuit Squadron, 35th Pursuit Group, transfers from Mount Gambier to Williamstown, Australia with P-39's; first mission is 2 June.