The Fall of Singapore during World War II made New Zealand realise that she could no longer rely on Britain to defend the British Empire. New Zealand troops supported the British in the successful battle against Communist insurrection in Malaysia and maintained an air-force fighter squadron in Singapore, and later on Cyprus, again supporting British forces. New Zealand diplomats sought an alliance with the United States of America, and in 1951 adhered to the ANZUS Treaty between New Zealand, Australia and the US. In return for America's guarantee of protection, New Zealand felt obliged to support America in its wars, and New Zealand committed forces to the Korean War (1950-1953) under United nation auspices and to the Vietnam War. By the 1970s, many New Zealanders began to feel uncomfortable with their country's support for the US, particularly in Vietnam and regarding the visits of nuclear-powered and armed American warships. The Third Labour government (1972–1975) pulled New Zealand troops out of the Vietnam War and protested against French nuclear testing in the Pacific, at one stage sending a warship to act as disapproving witness to the tests.