Ulithi Atoll (also know as Urushi or Mackenzie Island) is a coral atoll in the western Pacific Ocean located in the Federated States of Micronesia. It is 106 miles east of Yap. Its islands have a total land area of 1.75 sq miles. It is the world's fourth largest lagoon measuring 209 square miles.
On September 20, 1944, occupied by American forces, without opposition. Ulithi was developed into a major US Naval base for the remainder of the war, including support for the Battle of Leyte Gulf, Okinawa, and the planned invasion of the Japanese mainland. Used by the US Navy 3rd and 5th Fleets after raids on Japanese home islands. It was abandoned by the USN in 1947.
Guam Island is located in the Territory of Guam in the Southern Mariana Islands of the Mariana Island Group in the Central Pacific.
On December 8, 1941 three hours after the attack on Pearl Harbor, Guam was attacked by Japanese aircraft. On December 10, 1941 Japanese forces made an amphibious landing on Guam and occupied until 1944.
On July 21, 1944, Guam was assaulted by the US Marine from the 3rd Amphibious Corps and U. S. Army 77th Division. The Japanese managed to contain the attackers on the two landing beach and counterattacked, but failed to repulse the landing.
After Guam was secured, the island was developed into a major base area with several airfields to support B-29 Superfortress operations against the Japan. Bypassed Japanese guerrilla activities continued until the end of the Pacific War.
Peleliu is an Island only 5 square miles, at the southern end of the Palau Island Group.
Peleliu was the site of one of the bloodiest battles of the Pacific War. 6,000 Japanese defended the island when the 1st Marine Division landed on September 15, 1944 on the southwest corner of the island. In two months there were over 20,000 casualties. The American drive was halted for a month on Umurbrogol ridge (know as the Battle of Bloody Nose Ridge). Organized Japanese resistance ended on October 13, 1944 although some Japanese soldiers held out for the rest of the war to harass American forces, or even longer.