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 Barnstable County, Massachusetts, United States.

The regular air force began leaving Otis in the late 1960s as improvements in radar made the 551st more costly when compared to newer technologies.

Following the 2005 Base Realignment and Closure Commission, the 102 FW was directed to transfer its F-15 aircraft to its sister unit, the 104th Fighter Wing at Barnes Municipal Airport/ANGB.

In the early 1970s, Otis AFB was marked for closure as part of a nationwide reduction of military bases, to cut costs as the Vietnam War wound down.

The major concern of Cape residents was the fate of base property and impacts on the local economy as military activities decreased.

In 1978, the Regular Air Force returned to Otis ANGB with the construction of the Precision Acquisition Vehicle Entry Phased Array Warning System (PAVE PAWS) near the Cape Cod Canal.

[6] The Federal Aviation Administration has released new flight procedures that identify the ICAO code KFMH with the name of Coast Guard Air Station Cape Cod.

[9] In May 2013, it was announced that one third of the 104th Fighter Wing's F-15 aircraft would be moving to Otis to take up an alert mission for four to six months, as Barnes Municipal Airport's runway underwent renovation.

[10][11] In December 2013, Otis was selected as a test site by the United States Federal Aviation Administration to "aid in researching the complexities of integrating Unmanned Aircraft Systems into the congested, northeast airspace."

Four minutes later, Lieutenant Colonel Timothy Duffy and Major Daniel Nash were scrambled and flew F-15 Eagle fighters out of the base heading toward New York City to intercept American Airlines Flight 11.

Military operations in the early years at Otis AFB included the use of petroleum products and other hazardous materials, such as fuels, motor oils, and cleaning solvents, and the generation of associated wastes.

Residents of nearby towns raised concerns about possible adverse effects on health of humans resulting from PAVE PAWS radiation.

Remediation on the site occurred in 1998[16] and a 2005 report from the National Academies Press found no evidence of adverse health effects from PAVE PAWS.

[18] In a rotary near the original main gate to the base, is a Lockheed F-94 Starfire (tail number 51-4335) which was, presumably, flown by future General Daniel "Chappie" James Jr. when he was a squadron commander at Otis AFB in the 1950s.