28 May 1943
- Cowpens was commissioned into service. ww2dbase [Cowpens | CPC]
- USS Gunnel started her second war patrol. ww2dbase [Gunnel | CPC]
- B-17 bomber "Old 666" conducted a camera mapping mission over southeastern New Ireland. ww2dbase [New Ireland | CPC]
- USS Sunfish shelled a Japanese oil refinery at Fais, Caroline Islands. ww2dbase [Sunfish (Gato-class) | Fais, Palau | CPC]
- Japanese and Chinese troops clashed in Hubei and Hunan Provinces, China, with the Chinese moving behind the Japanese 13th Division, threatening to cut its supply lines. ww2dbase [Battle of Exi | CPC]
- Kamoi arrived at Kendari, Celebes, Dutch East Indies at 1411 hours; she unloaded 1,000 tons of cement. ww2dbase [Kamoi | Kendari, Celebes | CPC]
- USS S-41 fired six torpedoes at a Japanese convoy in the Sea of Okhotsk, scoring one hit on a four-masted fishing schooner Asuka Maru, sinking her. ww2dbase [S-41 | Sea of Okhotsk | CPC]
- Gato-class submarine USS Silversides had the following entry made into her log, "On the 28th a frigate bird made a high level bombing attack, scoring a direct hit on the bare head and beard of the OOD, Lt. Bienia. No indication by radar prior to attack." ww2dbase [Silversides | DS]
- USS Saury torpedoed and sank the Japanese tanker Akatsuki Maru (10,216 tons) about 90 miles north-west of Okinawa. ww2dbase [Saury | East China Sea | DS]
- USS Pennsylvania arrived at Puget Sound Naval Shipyard for an overhaul. ww2dbase [Puget Sound Navy Yard | Pennsylvania | Bremerton, Washington | DS]
- Archerfish was launched at the Portsmouth Navy Yard in Kittery, Maine, United States, sponsored by Eleanor Roosevelt's personal secretary Malvina Thompson. ww2dbase [Archerfish | Kittery, Maine | CPC]
- A British military mission led by Captains Frederick W. D. Deakin and William F. Stuart made the long delayed arrival at the headquarters of Yugoslav National Liberation Army's leader Josip Broz (Tito). ww2dbase [AC]

28 May 1943 Interactive Map
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