The United States service academies, also known as the United States military academies, are federal academies for the undergraduate education and training of commissioned officers for the United States Armed Forces.
There are five U.S. service academies:
Service academies can be used to refer to all of the academies collectively. However, in popular usage, this term is more often used for the academies of three branches of the military: those of the Army, Navy, and Air Force (under the Department of Defense); and that of the Coast Guard (under the Department of Homeland Security). These are the only four academies whose students are on active duty in the Armed Forces of the United States from the day they enter the Academy, with the rank of officer cadet or midshipman, and subject to the Uniform Code of Military Justice. Students at these academies cannot, however, count this active duty time towards military active/retired pay and allowances nor can they claim the time for years of service for retirement. In the case of the Merchant Marine Academy, midshipmen may elect to receive an active duty or reserves commission in any branch of the uniformed services, including NOAA and the U.S. Public Health Service, most are commissioned into the Navy Reserve, Strategic Sealift Officer Program.
In the context of college football, the term "service academies" most often refers specifically to the grouping of Army, Navy, and Air Force, the three academies whose football teams compete in the top-level NCAA Division I FBS. The three schools compete annually for the Commander-in-Chief's Trophy. Coast Guard and Merchant Marine compete at the NCAA Division III level and play each other annually for the Secretaries Cup (formerly Secretary's Cup when both academies were under the Department of Transportation).