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Found this in Wikipedia about the aftermath of Peleliu.

The reduction of the Japanese pocket around Umurbrogol mountain is considered[4] to be the most difficult fight that the U.S. military encountered in the entire Second World War. The 1st Marine Division was severely mauled and it remained out of action until the invasion of Okinawa on April 1, 1945. In total the 1st Division suffered over 6500 casualties during their month on Peleliu, over a third of their entire division. The 81st Infantry Division suffered over 3000 casualties during their tenure on the island.
The battle was controversial due to its lack of strategic value. The airfield captured on Peleliu was of little use for the attack on the Philippines. The island was never used for a staging operation in subsequent invasions; the Ulithi Atoll, in the Caroline Islands north of the Palaus, was used as a staging base for the invasion of Okinawa. In addition, few news reports were made on the battle. Due to Rupertus' "3 days" prediction, only six reporters bothered coming ashore. The battle was overshadowed by MacArthur's return to the Philippines and the Allies push towards Germany in Europe.