This disagreement ended in September 1962. As part of the expansion of the military in response to Indonesia's policy of "confrontation" with its neighbours, the RAAF was directed by the Australian Government to conduct an urgent evaluation of short takeoff and landing aircraft and heavy-lift helicopters that could be purchased to improve the Army's tactical mobility. An Air Staff Requirement was established in October that year for a project to acquire eight heavy-lift helicopters and introduce them into service by 1971. A team of seven RAAF officers headed by Group Captain Charles Read, the director of operational requirements, was immediately dispatched to the United States and assessed the Sikorsky S-61, Boeing Vertol 107-II and CH-47 Chinook helicopters. The team judged the Chinook to be clearly the most suitable of these types, and recommended that several be acquired; this was in line with the Army's preference. The Government subsequently accepted a recommendation made by the RAAF to acquire a package of twelve Caribou fixed-wing aircraft and eight Chinooks, and placed an order for these aircraft within weeks of the evaluation. The Chinook order was cancelled by the Government when it was learned that it would take several years for the helicopters to be delivered, and the RAAF's orders of Caribous and Bell UH-1 Iroquois tactical transport helicopters were expanded instead.