North Truro Air Force Station

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North Truro Air Force Station (1951-1985) - A Cold War Air Force Radar Station first established in 1951 on Cape Cod, Barnstable County, Massachusetts. Named North Truro Air Force Station after the location. Initially assigned a Permanent ID of P-10 and later a Sage ID of Z-10, a JSS ID of J-53, and an FAA ID of QEA. The Air Force Station was decommissioned in 1985 and partly turned over to the FAA and the remainder to the National Park Service. Now known as North Truro FAA Radar Site.

North Truro AFS Bachelor Officer Quarters Building 23.
North Truro AFS NCO Barracks Building 39.
North Truro Air Force Station Site, FAA ARSR-4 Radar.


North Truro AFS Power Building 33.

Established in 1951 and became operational as North Truro Air Force Station manned by the 762nd AC&W Squadron. The station initially had both a Ground-Control Intercept (GCI) and early warning mission. The early warning mission involved tracking and identifying all aircraft entering their airspace while the GCI mission involved guiding Air Force interceptors to any identified enemy aircraft. Controllers at the station vectored fighter aircraft at the correct course and speed to intercept enemy aircraft using voice commands via ground-to-air radio.

Initial equipment included two CPS-3 transportable search radar.

SAGE System Transition

North Truro Air Force Station Former AC&W Operations Building 33.

The transition of the manual GCI system to the automated SAGE system began with the installation of the FST-2 coordinate data transmitter and search radar upgrades. The FST-2 equipment digitized the radar returns and transmitted the digital returns to the SAGE direction center. Under the SAGE System, interceptor aircraft were directed to their targets by the direction center computers and controllers, greatly reducing the need for local controllers and equipment at every radar station.

The FST-2 was a very large digital system using vacuum tube technology. Over 6900 vacuum tubes were used in each FST-2 requiring 21 air-conditioned cabinets, 40 tons of air conditioning, 43.5 kva of prime power, and usually a large new addition to the operations building. The FST-2B modification added two more cabinets but with newer solid-state (transistor) technology to process coded responses from aircraft transponders.

SAGE System Operation

North Truro Direction & Sectors
Assigned Direction Center Sector
8 Jan 1957 - 1 Apr 1966 Stewart SAGE Direction Center DC-02 Boston Air Defense Sector
1 Apr 1966 - 19 Nov 1969 Hancock SAGE Direction Center DC-03 35th Air Division
19 Nov 1969 - 31 Aug 1983 Hancock SAGE Direction Center DC-03 21st AirDivision24th Air Division
31 Aug 1983 - 14 Jun 1985 Griffiss JSS ROCC 24th Air Division
Northeast Air Defense Sector
North Truro Air Force Station Former SAGE & BUIC Operations Building 29.

The site began operation as a SAGE site in 1958 initially feeding the Stewart SAGE Direction Center DC-02 at Stewart AFB. With the closure of DC-02 in 1966 North Truro was connected to the Hancock SAGE Direction Center DC-03 at Hancock Field.

In 1960 the search radar was upgraded to an FPS-7 and two FPS-6 height-finders were installed. The FPS-7 search radar was later upgraded to become an FPS-107.

In 1963 one of the FPS-6 height-finders was modified to become an FPS-90 while the other was replaced by an FPS-26A. The FPS-90 was modified to become an FPS-116 circa 1977 and the FPS-26A was totally removed early in 1979.

Texas Tower 2

TT-2 circa 1956 Note the Tropo Communications Dishes on the Side. The Landside Terminal was at North Truro AFS.

Texas Tower 2 (TT-2) was an important part of the North Truro AFS mission in the late 1950s and early 1960s because it served to support tower personnel, logistics and served as the terminal for communications from the tower. The tower was built of steel with three decks in a triangular shape. Supporting the tower were three legs that anchored it to the ocean floor. Tower two was floated out to Georges bank arriving about 15 Jul 1955.

TT-2 had three decks, the two lower decks housed the mechanical equipment and the crew quarters. Most of the top deck (weather deck) was devoted to a helicopter landing area and two large cranes. One side of the weather deck, enclosed in a 210' by 60' structure, was the operations area, radar, FST-2, and communications gear. Atop that structure were the three radar sets with antennas enclosed in protective bubbles.

On 7 May 1957, the tower was declared operational on a limited basis. On 17 Apr 1958, it was declared fully operational in a manual mode. In September 1958 TT-2 became SAGE system operational feeding digitized radar data by tropospheric radio system, FRC-56 to North Truro AFS and from there by landline to the Stewart SAGE Direction Center DC-02. Communications with the shore were through the tropospheric radio system, FRC-56. The landside FRC-56 terminal was located at North Truro AFS and through it passed all the data and voice communication circuits to and from TT-2.

TT-2 was decommissioned on 15 Jan 1963. Salvageable equipment was removed and a salvage company then dynamited the three legs hoping to float the upper structure to the shore. Instead of floating the structure sank and was not recoverable.

ALRI System

USAF Lockheed EC-121D Warning Star of the 552nd Airborne Early Warning and Control Wing over Thailand, 1972.

In 1962 an Airborne Long Range Inputs (ALRI) ground facility was commissioned at North Truro AFS to process ALRI data from EC-121 Airborne radar aircraft stationed at Otis AFB (551st Airborne Early Warning and Control Wing). This radar-equipped aircraft few fixed stations 300 miles out over the Atlantic to extend the range of land-based radar coverage and to supplement the Texas Towers coverage. When the Texas Towers closed, they replaced the coverage. The ALRI Facility received radar data from the planes and sent it into the SAGE System.

BUIC System

BUIC Data Flow showing ALRI Interface.

North Truro AFS played a significant role in the development of the BackUp Interceptor Control (BUIC) program. The BUIC program came about as budget cuts forced the closure of radar sites and SAGE direction centers. The BUIC concept allowed the BUIC equipped sites to take over the functionality of one or more direction centers should they become inoperative. This capability was to have been achieved by adopting more advanced computer systems and software but it also required each BUIC site to have a full complement of highly trained weapons controllers, a very expensive proposition. At the same time the threat from manned bombers was reduced and the vulnerability of radar sites and direction centers increased. In 1974 all of the BUIC III capability was mothballed except the site at Tyndall AFB, Florida. North Truro was the first BUIC II site activated and first radar station to be designated a BUIC III site. BUIC operations ended at North Truro AFS in 1974.

Air Force Station Closure

North Truro AFS was decommissioned in a 14 Jun 1985 ceremony at the station. A small part of the property was transferred to the FAA and is operated by the FAA as the North Truro FAA Radar Site.

North Truro FAA Radar Site

North Truro FAA Radar Site ARSR-4 Tower & Radome.

This FAA radar site was established on the closure of North Truro Air Force Station in 1985. The initial search radar was an FPS-91A and the Air Force FPS-107 was removed. After the Air Force station closed the FPS-116 height-finder radar remained operational until it was removed circa 1988.

A FYQ-47 Common Digitizer was probably placed in service by February 1973 when the USAF/FAA FST-2 to FYQ-47 replacement program was completed. By 1990 the site was equipped with an FPS-91A search radar and a CD-2C Common Digitizer. The North Truro CD-2C was scheduled to receive an upgrade kit to implement three level weather data processing in September 1992.

A new ARSR-4 3D search radar was installed between 1996 and 1999. Construction was underway on the ARSR-4 tower and dome in October 1994 when it was put on hold by the FAA over local concerns about the location, design and health risks. Construction resumed after the concerns were addressed and the site currently operates the ARSR-4 3D radar and an ATCBI-6M Beacon system.

The radar site data is now available to the USAF/NORAD Battle Control System-Fixed (BCS-F) operations centers (EADS & WADS) as well as the FAA Boston ARTCC (ZBW) and adjacent ARTCCs. Other federal agencies have access to the data under the Homeland Security umbrella.

Gap Fillers

North Truro AFS was responsible for the maintenance of three remote unattended gap-filler radar sites. The gap-filler sites were placed in locations where the main search radar lacked coverage. These sites sent digitized radar target data directly to a direction center. Maintenance teams were dispatched from North Truro AFS for regularly scheduled maintenance or when fault indicators suggested the site had problems. North Truro was responsible for gap-filler sites at Westboro and Chilmark Massachusetts and the site at Fort Dearborn, New Hampshire.

North Truro AFS Gap Filler Radar Sites (edit list)
ADC NORAD Location State Type From To GPS Notes
P-10A Z-10A Westboro MA FPS-14, FST-1 1957 1962 42.239825,
Tower Remains
P-10B Z-10B Fort Dearborn NH FPS-14, FST-1 1957 1968 43.044698,
Located on Fort Dearborn
No remains
P-10E Z-10E Chilmark MA FPS-14, FST-1 1957 1968 41.355278,
No remains

Physical Plant

The physical plant of the site was divided into the main site, a housing area, a radio site, and a troposcatter communications site. The main site housed two operations buildings (AC&W & SAGE), the radar towers, the enlisted barracks, the bachelor officer's quarters, the orderly room, the chow hall, the motor pool, and the backup generators. Apart from the main site was a small 27 unit housing area for married personnel. A separate radio site housed the radio equipment for directing aircraft intercepts. A troposcatter communications site was used for communications with Texas Tower 2, a radar platform 90 miles out in the Atlantic.

North Truro AFS Plan
North Truro AFS Structures (edit list)
Number Building Area Currently
T2 Chapel Cantonment No
T5 NCO Club/Mess Cantonment Yes
7 Water Plant Cantonment Yes
9 Headquarters/Admin Cantonment Yes
10 Barracks Cantonment Yes
11 Barracks Cantonment Yes
12 Barracks Cantonment Yes
14 Library Cantonment Yes
15 Bowling Alley Cantonment No Foundation
16 Gym Cantonment Yes
17 Post Exchange Cantonment Yes
18 Dining Hall Cantonment Yes
19 Central Heating Cantonment Yes
23 Bachelor Officer Quarters Cantonment Yes
24 Radio Site Radio No
29 Operations Bldg Main Yes
30 Radar Tower, CPS-6B Main No
31 Power Plant Main Yes
32 Office/Storage Main Yes
33 Old AC&W Operations Bldg Main Yes
34 Supply/Shop Main Yes
35 Maintenance shed Main Yes
36 Supply/Shop Main Yes
37 Auto Shop Cantonment Yes
38 NCO Barracks Cantonment Yes
39 NCO Barracks Cantonment Yes
40 Radar Tower, FPS-7/107 Main No Base
42 Radar Tower, FPS-6 Main No
44 Shed  ?
45 Commissary Cantonment Yes
47 Operations building storage Main  ?
48 Radar Tower, FPS-26A Main No
49 Radar Tower, FPS-6 Main No Base
60 Former gas station Cantonment
74 Theater Cantonment No
101 House, 3bdr Family Housing Yes
102 House, 2bdr Family Housing Yes
103 House. 3bdr Family Housing Yes
104 House, 2bdr Family Housing Yes
105 House, 3bdr Family Housing Yes
106 House, 2bdr Family Housing Yes
107 House, 3bdr Family Housing Yes
108 House, 2bdr Family Housing Yes
109 House, 3bdr Family Housing Yes
147 AT&T Main Yes
201 House, 3bdr Family Housing Yes
202 House, 3bdr Family Housing Yes
203 House, 3bdr Family Housing Yes
204 House, 3bdr Family Housing Yes
205 House, 3bdr Family Housing Yes
206 House, 3bdr Family Housing Yes
207 House, 3bdr Family Housing Yes
208 House, 3bdr Family Housing Yes
209 House, 3bdr Family Housing Yes
210 House, 3bdr Family Housing Yes
211 House, 3bdr Family Housing Yes
212 House, 3bdr Family Housing Yes
213 House, 3bdr Family Housing Yes
214 House, 3bdr Family Housing Yes
215 House, 4bdr Family Housing Yes
216 House, 3bdr Family Housing Yes
217 House, 3bdr Family Housing Yes
218 House, 3bdr Family Housing Yes

Current Status

North Truro AFS, NPS Interpretive Signage of the Site Role with Texas Tower II

A small part of the property was transferred to the FAA and that now houses their ARSR-4 Radar. The remainder of the site, including most of the buildings, was transferred to the National Park Service in 1994 and is now part of the Cape Cod National Seashore.

North Truro AFS Major Equipment List
Search Radar HF Radar Data Systems Scopes Comm IFF/SIF/Beacon

Unit Designations
  • 762nd Aircraft Control & Warning (AC&W) Squadron (1951-1958)
  • 762nd Radar Squadron (SAGE) (1958-1970)
  • 762nd Air Defense Group (BUIC) (1970-1974)
  • 762nd Radar Squadron (1974-1979)
762nd Assignments
  • 1 Jan 1951 - Assigned at North Truro AFS, MA, assigned to 540th AC&W Gp.
  • 6 Feb 1952 - Transferred to 52nd AD.
  • 16 Feb 1953 - Transferred to 4707th Def Wg.
  • 18 Oct 1956 - Transferred to 4622nd AD Wg.
  • 8 Jan 1957 - Transferred to Boston ADS. Stewart SAGE Direction Center DC-02
  • 15 Dec 1958 - Redesignated from AC&W Sq to 762nd Radar Sq (SAGE).
  • 1 Apr 1966 - Transferred to 35th AD. Hancock SAGE Direction Center DC-03
  • 19 Nov 1969 - Reassigned to 21st AD. Hancock SAGE Direction Center DC-03
  • 1 Mar 1970 - Inactivated 762nd Radar Sq (SAGE) and reactivated as 762d Air Defense Group.
  • 1 Jan 1974 - 762d Air Defense Group inactivated and redesignated 765th Radar Squadron.
  • Nov 1979 - Reorganized into TAC (ADTAC)
  • 14 Jun 1985 - North Truro AFS decommissioned.
  • 1994 - USAF operations ended.

North Truro Air Force Station Partial Commanders List (edit list)
Assumed Relieved Rank Name Cullum Notes
1950-11-27 Captain Scheid, Raymond L. Jr N/A
1950-12-16 Captain Zupko, John N/A
1951-01-15 Lt Colonel Curtis, Frank M. Jr N/A
1951-05-20 Major Hartley, James R. N/A
1951-08-01~ Major Hoddy, Lee J. N/A
1852-05-13 Major Woody, Rufus Jr N/A
1953-06~ Major Sherwin, John F. N/A
1954-11~ Major Kallman, Roderick A. N/A
1956-07-03 Major Sherwin, John F. N/A
1961~ Major Kendrick, Chester A. N/A promoted to Lt Col
1964-04~ Major Tolbert, George W. N/A
1964-05-15 Major Weinig, John W. N/A
1964-08~ Lt Colonel Kendrick, Chester A. N/A
1964-09-08 Major Weinig, John W. N/A
1965-12~ Lt Colonel Geary, James R. N/A
1967-03-28 Lt Colonel MacMonagle, William D. N/A
1967-09-20 Colonel Schueler, Eldor H. N/A
1967-11-17 Lt Colonel Evans, John N. N/A
1969-06~ 1970-03-01 Colonel Henehan, Alva D. N/A
Major Perry, Robert J. N/A
1971 1974 Lt Colonel Prince, Robert E. N/A
1976 Lt Colonel Hall, Franklin D. N/A
1982~ Major Billings, N/A

Current Status

North Truro AFS NPS Overview of the Site

Part of the Cape Cod National Seashore administered by the National Park Service on Cape Cod, Barnstable County, Massachusetts. Most of the buildings are still standing but closed. Several interpretive signs are located on the site.

Location: Cape Cod, Barnstable County, Massachusetts.

Maps & Images

Lat: 42.03347 Long: -70.05427

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: 155'

GPS Locations:

See Also:



Visited: 3 May 2018, 17 May 2012

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