He remained in that assignment until the end of December 1943 and joined 8th Marine Regiment as acting Commanding officer. The 8th Marines needed rest and refit after heavy fighting on Tarawa as the part of 2nd Marine Division and Griebel spent four months with the intensive training in mountainous area between the great volcanoes of Mauna Kea and Mauna Loa. He was relieved from his temporary command at the beginning of April 1944 and transferred to the staff of 2nd Marine Regiment under Colonel Walter J. Stuart as Executive officer.