Okinawa Christian School International (OCSI) is a private Christian school located on the island of Okinawa, Japan. OCSI was established in 1957 in order to provide an English-language K-12 education for the children of American missionaries. During the first year, Mrs. Esther Austin taught a class of 11 children in an unused building at the Far East Broadcasting Network's facility in Chatan. The purpose of the school was broadened to include children of non-Christian and non-church-affiliated families in the first few years. The school eventually moved into a more permanent facility on present-day Camp Lester (then called Camp Kuwae) consisting of two Quonset huts. Looking to the future, OCSI purchased land on "Hacksaw Ridge" in Urasoe City, a site of fierce fighting during the Battle of Okinawa in WWII. By 1965 students moved into a new, larger school facility.