Both the United States and Australia cited the alliance as justification for involvement in Vietnam.[1] U.S membership in SEATO provided the United States with a rationale for a large-scale U.S military intervention in Southeast Asia.[2] Other countries, such as the UK and key nations in Asia, accepted the rationale.[13] In 1962, as part of its commitment to SEATO, the Royal Australian Air Force deployed CAC Sabres of its No. 79 Squadron to Ubon Royal Thai Air Force Base, Thailand.