Otis Air National Guard Base (IATA: FMH, ICAO: KFMH, FAA LID: FMH) is an Air National Guard installation located within Joint Base Cape Cod, a military training facility, located on the western portion of Cape Cod, in western Barnstable County, Massachusetts, United States. It was previously known as Otis Air Force Base prior to its transfer from the active duty Air Force to the Air National Guard. In the community, it is also known as Otis Air Base or more commonly by its old name, Otis Air Force Base. It was named in honor of pilot and Boston surgeon, Lt.