Commonwealth of Northern Mariana Islands

Tinian North Field on Tinian Island in the Commonwealth of the Northern Mariana Islands is one of the most historically significant airfields of the Second World War. It was built up by U.S. forces after the capture of Tinian in mid‑1944 and became a primary base for B‑29 Superfortress operations against the Japanese home islands in the final year of the war. From here, long‑range bombing missions, including the atomic bomb attacks on Hiroshima and Nagasaki, were launched, making the site a key operational hub in the closing stages of the Pacific campaign.​

The airfield occupies the northern tip of Tinian, near Ushi Point, and was originally developed by the Japanese as Ushi Point Airfield before being heavily bombed and then captured by U.S. Marines in July 1944. U.S. Navy Seabees rapidly expanded the facility into what became one of the busiest airfields in the world at the time, with four long, parallel runways, extensive hardstands, and support infrastructure capable of hosting hundreds of heavy bombers. North Field and the adjacent landing beaches now form part of a designated National Historic Landmark District, reflecting their importance in military and world history.​

Technically, North Field was a massive wartime engineering project carved out of coral and limestone in just weeks, involving the movement of close to a million cubic yards of material to create multiple runways and taxiways strong enough for fully loaded B‑29s. The American expansion produced four roughly east–west, crushed‑coral runways around 8,000 feet long, surrounded by dispersal areas and hardstands designed to reduce vulnerability to attack while streamlining maintenance and turnaround for large bomber fleets. Specialized facilities included bomb loading pits used for handling the oversized atomic weapons, where aircraft such as the Enola Gay and Bockscar were positioned over recessed pits so the bombs could be hoisted directly into their bays. Today, the runways and bomb pits remain visible, and although much of the wartime infrastructure has disappeared, the site is a powerful open‑air memorial and a growing focus of preservation and limited reuse discussions in the region