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• Japanese hospital ship Hikawa Maru departed Manila, Philippine Islands. ww2dbase [Hikawa Maru | CPC]
• Royal Sovereign was decommissioned from service. ww2dbase [Royal Sovereign | CPC]
• USS Guitarro sank the heavily-escorted cargo ship Shisen Maru off Taiwan, hitting her with two of the three torpedoes fired. ww2dbase [Guitarro | CPC]
• USS Finback completed refitting at Pearl Harbor, US Territory of Hawaii and departed for her ninth war patrol. ww2dbase [Finback | CPC]
• USS Pompon sank cargo ship Shiga Maru off Murotosaki, Shikoku, Japan, hitting her with 1 of 3 torpedoes fired. ww2dbase [Pompon | CPC]
• Destroyers USS Nicholas, USS Hopewell, USS O'Bannon, and USS Taylor arrived at Blanche Harbor, Treasury Islands, Solomon Islands. ww2dbase [Nicholas | DS]

• Brigadier General Haydon Boatner relieved John McCammon as the commanding officer of all American and Chinese units in the area of Myitkyina, Burma. ww2dbase [Haydon Boatner | Battle of Myitkyina | John McCammon | Myitkyina | CPC]

• At Pearl Harbor, submarine USS Spearfish experienced a change of command with Lieutenant Commander Cyrus C. Cole relieving Lieutenant Commander Joseph Williams. ww2dbase [Spearfish | Pearl Harbor, Oahu | DS]

• Major General Nobuo Tanaka canceled his offensive in the Imphal region in India after incurring heavy losses. To the north at Kohima, the Indian 7th Division assault on Dyer Hill, Pimple Hill, and Big Tree Hill, which began on 24 May, was repulsed with heavy casualties. ww2dbase [Battle of Imphal-Kohima | Kohima, Assam | CPC]

• British troops captured Arce, Italy; US 36th Infantry Division penetrated between German 1st Parachute Corps and LXXVI Panzer Corps on the Caesar C Line. Also on this day, after seven German divisions successfully withdraw along Route 6 in Italy, Albert Kesselring allowed his troops in the Velletri gap to slowly fall back. ww2dbase [Battle of Anzio | Lazio | TH, CPC]

• Casablanca-class escort carrier USS Steamer Bay arrived at Espiritu Santo, New Hebrides. ww2dbase [Steamer Bay | Pallikulo Bay, Espiritu Santo | DS]

• Remnants from a test launch of a German A4 rocket at Blizna, Poland were recovered by Polish resistance fighters. ww2dbase [Vergeltungswaffe 2 | V-Weapons Campaign | Blizna, Podkarpackie | CPC]

• In a Daily Telegraph crossword puzzle the word "Mulberry" appeared as one of the answers. This caused considerable consternation among Allied invasion planners as "Mulberry" was the codename for the floating harbours and facilities to be used during the invasion landings in France. ww2dbase [Normandy Campaign, Phase 1 | AC]

30 May 1944 Interactive Map