The Five Power Defence Arrangements (FPDA) are a series of bilateral defence relationships established by a series of multi-lateral agreements between Australia, Malaysia, New Zealand, Singapore, and the United Kingdom, all of which are Commonwealth members that once belonged to the British Empire. Signed in 1971, the FPDA consists of the five powers consulting each other "immediately" in the event or threat of an armed attack on any of the FDPA members for the purpose of deciding what measures should be taken jointly or separately in response. There is no specific commitment to intervene militarily, and the agreement is merely consultative. The Five Powers Defence Arrangements do not refer to exclusive economic zones (EEZ), and the enforcement of a state's EEZ rights is a matter for that state, which may request the assistance of other states in so doing. History The FPDA was set up following the termination of the United Kingdom's defence guarantees of Malaya under the Anglo-Malayan Defence Agreement, as a result of the UK's decision in 1967 to withdraw its armed forces east of Suez. Under the Five Powers Defence Arrangements, the five 'powers' (Australia, Malaysia, New Zealand, Singapore and the United Kingdom) are to consult each other "immediately" in the event or threat of an armed attack, although there is no specific commitment to intervene militarily. The FPDA provides defence co-operation between the countries, establishing an Integrated Air Defence System (IADS) for Peninsular Malaysia and Singapore based at RMAF Butterworth under the command of an Australian Air Vice-Marshal (2-star). RMAF Butterworth, was under the control of the Royal Australian Air Force until 1988, and is now run by the Royal Malaysian Air Force but hosts rotating detachments of aircraft and personnel from all five countries. In 1981, the five powers organised the first annual land and naval exercises. Since 1997, the naval and air exercises have been combined. In 2001, HQ IADS was redesignated Headquarters Integrated "Area" Defence System. It now has personnel from all three branches of the armed services, and co-ordinates the annual five-power naval and air exercises, while moving towards the fuller integration of land elements. An annual FPDA Defence Chiefs' Conference (FDCC) is hosted by either Malaysia or Singapore, and is the highest military professional forum of the FPDA and serves as an important platform for dialogue and exchange of views among the Defence Chiefs. There is also a Five Powers Defence