Once more homeward bound, Mount Katmai was underway from Subic Bay on 12 January 1967, arriving San Francisco on 7 February. After overhaul in Mare Island Naval Shipyard until 19 July, and type training, the ammunition ship was ready to sail west again. Leaving San Francisco on 7 August 1967, she arrived at Subic Bay on 30 August via Pearl Harbor. Rearming operations were conducted in the South China Sea and off the coast of Vietnam with carriers and fire support ships.