Tinian Naval Base and Naval Air Facility Tinian (NAF Tinian) was a major United States Navy sea and airbase base on Tinian Island, part of the Northern Mariana Islands on the east side of the Philippine Sea in the Pacific Ocean. The Base was built during World War II to support the many bombers and aircraft fighting and patrolling in the South West Pacific theatre of war as part of the Pacific War. A number of naval facilities were built on the entire island of 101.22 km (39 sq miles). The main port was built at the city and port of San Jose, also called Tinian Harbor. All construction was done by the Navy's Seabees Sixth Construction Brigade with minor help from the 64th Army Engineers, including the main two airports: West Field and North Field. United States Army Air Forces operated lo