The Marianas Operation - Stage 3 - Tinian - 1944 This multi-part World War II documentary, produced by the United States Marine Corps, provides a detailed examination of the campaign to take the Marianas from the Japanese. Phase 3. Tinian: Following the 2nd and 4th Marine Divisions landings on 24 July 1944, supported by naval bombardment and artillery firing across the strait from Saipan.