 The Chinook became a vital transit tool during the 1991 Gulf War in Iraq . They were used for moving troops into the region at the start of the conflict ; a Chinook was used on 22 January 1991 to transport a Special Air Service ( SAS ) patrol on the infamous Bravo Two Zero mission . In the aftermath of the conflict as many as nine British Chinooks delivered food and supplies to thousands of Kurdish refugees from Iraq . 
