Although the March 1979 Peace Treaty between Israel and Egypt caused UNEF II to disband, the role was taken over by the Sinai Multinational Force and Observers. In an annex to the March 1979 treaty, the United States undertook to organise a multinational force of equivalent strength to UNEF II if the United Nations was unable or unwilling to provide the forces envisaged by the treaty. In February 1982, Australia announced that is would contribute to the force by providing a helicopter unit. The unit was formed at El Garah in the Sinai on 22 March 1982 and comprised eight Iroquois helicopters and 100 air crew and support personnel. The Australians were withdrawn in March 1986.