Kunia Tunnel Field Station

Kunia Tunnel Field Station, also known as Kunia Regional SIGINT Operations Center, is a United States military intelligence facility located near Schofield Barracks on the island of Oahu, Hawaii. Originally constructed in 1942 as an underground facility to protect supplies and personnel from Japanese attack during World War II, it later became a key site for signals intelligence (SIGINT) and communications monitoring during the Cold War. The station was operated by the U.S. Army and later supported joint operations with the National Security Agency (NSA). Today, Kunia Tunnel continues to play an important role in intelligence gathering and information analysis for U.S. forces in the Pacific region.