The USMF was comprised of several different branches. Included were the; * United States Army * United States Air Force * United States Navy * United States Marine Corps The United States National Guard was a part of the Military Forces. The National Guard, which had both Army and Air Force units, was based in each of the member states that made up the United States. They were primarily a reserve force that normally operated under the authority of the Governor of the state they were based in, unless called to Federal service.