The Air Force’s first C-17 cargo plane has officially retired, arriving at the National Museum of the U.S. Air Force in Dayton, Ohio, on Wednesday. This Globemaster was basically a handmade prototype, and flew for the first time on September 15, 1991, nine months after the first Gulf War. The C-17 fleet has become the service’s go-to airlifter, and not just for grunts and gear: early Friday, after Defense Secretary Leon Panetta’s airplane broke down in Chile, the SecDef and his party shifted to a C-17 for the long flight home.