United States
U.S. Air Force Academy cadet’s service cap
The USAFA is the air force equivalent of the army’s West Point and the navy’s Annapolis, offering a full four-year university degree for future armed-forces officers. The Acadamy is headquartered in Colorado Springs, Colorado. Although most cadets wear ordinary garrison caps, this service cap is used for more formal occasions.

A nice photo montage from the Air Force Academy—shamelessly stolen from their website.