Most American government contract flights are sponsored by the military. While many of them are used to move cargo, some are operated as scheduled airline services. These flights are virtually identical to standard airline flights, complete with flight attendants, meal service, and in-flight movies. A contract flight returning from an overseas area is often referred to as a freedom bird, since it usually carries military members who are returning to the United States after what is commonly a one-to-three-year tour of duty. The service on board during the Vietnam War was very spartan and did not offer the amenities mentioned above.