 The ship was deployed to Vietnam in 1971 as part of the Vietnam War.In January 1975, "Peoria", operating with the amphibious ready group (ARG) Alpha in the western Pacific, was deployed to east Asian waters in preparation for the possible fall of the US-backed government in Cambodia.On 2 February, "Peoria" was detached from ARG Alpha with a Marine Corps unit to take part in a military exercise on Tinian.