and nine missing. The division remained on the island of Guam for training, until it embarked as part of the landing force for the Battle of Iwo Jima. The 3rd Marine Division was initially in reserve for the battle. However, the division was committed one regiment at a time when the initial regiments that landed there needed to be relieved. The 21st Marines came ashore on 21 February followed by the 9th Marines, 12th Marine Regiment, 3rd Tank Battalion, on 24 February. The Marines of these two infantry regiments, supported by the artillery of the 12th Marine Regiment and tanks of the 3rd Tank Battalion, fought on Iwo Jima until the end of organized resistance on 16 March and the subsequent mopping up operations for the next month. All elements of the division were back on Guam by 17 April 1945. The fighting on Iwo Jima cost the 3rd Marine Division 1,131 killed in action and another 4,438 wounded. After the return to Guam, the division began preparing for the invasion of Japan. This invasion never took place since Japan surrendered on 15 August 1945. The 3rd Marine Division was decommissioned on December 28, 1945 at Marine Corps Base Camp Pendleton, CA. During the war, the 3rd Marine Division had three Seabee Battalions assigned to it. The 25th Naval Construction Battalion (NCB) was posted to 19th Marines as the third battalion of the regiment. These landed on Bougainville, as did the 71st NCB which was assigned as the 3rd Division's shore party there. The 25th NCB also landed during the assault on Guam as the shore party to the 3rd Marine Regiment, after which the 19th Marines were deactivated, and the 25th NCB was reassigned. The 62nd NCB was then posted TAD to the 3rd for Iwo Jima. They were in the reserve, but they became the lead battalion in getting airfield No. 1 operational, after of the many casualties taken by the primary assault Seabees, the 133rd NCB. Korean War The division was reactivated on 7 January 1952 at Camp Pendleton, California, using the assets of the 3d Marine Brigade activated in June 1951. Immediately after its activation and still in its organizational state, the division began intensive combat training, including new tactics and maneuvers based on lessons learned in the then-ongoing Korean War. During the remaining part of 1952 elements of the division participated in numerous exercises and