CH-47 Chinook Customers. The Chinook is a multi-mission aircraft in use by U.S. Army, U.S. Army Reserve, National Guard and more than 19 countries, including Canada, the United Kingdom, Netherlands, Japan, Italy, Greece, Spain, South Korea, Australia and the United Arab Emirates.H-47 Chinook Customers. The Chinook is a multi-mission aircraft in use by U.S. Army, U.S. Army Reserve, National Guard and more than 19 countries, including Canada, the United Kingdom, Netherlands, Japan, Italy, Greece, Spain, South Korea, Australia and the United Arab Emirates.