Naval Support Facility Kamiseya (上瀬谷通信施設, Kamiseya Tsūshin Shisetsu) (UIC 0557A) is a detachment of U.S. Naval Air Facility, NAF Atsugi, Japan. The facility is located on the Kantō Plain, approximately three miles (5 km) northeast of NAF Atsugi, and 7.55 miles (12.15 km) WNW of Yokohama. The base consists of 587 acres (2.4 km²) with 110 acres (0.4 km²) within the fence line. It has 184 buildings (including three bachelor quarters and 68 housing units) and a plant property value of $100 million.