29 Military installations established in 1941

HMS Aggressive was a shore establishment of the British Royal Navy during World War II, based at Newhaven, East Sussex.

The Arkansas Ordnance Plant Guard House is a historic military structure on the grounds of the Jacksonville Museum of Military History in Jacksonville, Arkansas. It is a square wood-frame structure measuring 9 by 9 by 12 feet, mounted on metal skids for ease of relocation. It is presently mounted on a concrete pad to the right of the main museum building, believed to be not far from its original location. It was built in 1941 as part of the facilities of the World War II-era Arkansas Ordnance Plant, a facility that produced fuses and detonators in Jacksonville. After the war it was moved to 1112 MacArthur Drive, and it was moved to the museum in 2006.

Avenger Field is a Texas airport in Nolan County, three miles west of Sweetwater. The National Plan of Integrated Airport Systems for 2011–2015 called it a general aviation facility.

RCAF Station Aylmer was a Royal Canadian Air Force airfield that was built between late 1940 and June 1941 northeast of Aylmer, Ontario. It was one of many built across Canada under the British Commonwealth Air Training Plan during World War II.

Coast Guard Base Kodiak is a major shore installation of the United States Coast Guard, located in Kodiak, Alaska. The largest tenant unit on the base is Air Station Kodiak. It is also the home port for several cutters. Historic elements that it includes are the Kodiak Naval Operating Base, Fort Greely, and Fort Abercrombie.

Fort Allen, officially Fort Allen Training Center, is a Puerto Rico National Guard military installation located on a 921-acre facility in Juana Díaz, Puerto Rico.

Fort Gordon, formerly known as Camp Gordon, is a United States Army installation established in October 1941. It is the current home of the United States Army Signal Corps, United States Army Cyber Corps, and Cyber Center of Excellence. It was once the home of The Provost Marshal General School and Civil Affairs School. The fort is located southwest of Augusta, Georgia. One of the major components of the installation is Advanced Individual Training for Signal Corps military occupational specialties. Signals Intelligence has become more visible and comprises more and more of the fort's duties.

Bangor Air National Guard Base is a United States Air National Guard base. Created in 1927 as the commercial Godfrey Field, the airfield was taken over by the U.S. Army just before World War II and renamed Godfrey Army Airfield and later Dow Army Airfield. It became Dow Air Force Base in 1947, when the newly formed U.S. Air Force took over many Army air assets. In 1968, the base was sold to the city of Bangor, Maine, to become Bangor International Airport but has since continued to host Maine Air National Guard units under a lease agreement with the city.

The Greensboro Training Center is a closed United States Army Air Forces installation. It was last assigned to the United States Army Personnel Distribution Command. It was closed on 15 December 1946.

Fort A.P. Hill is a training and maneuver center belonging to the United States Army located near the town of Bowling Green, Virginia. The center focuses on arms training and is used by all branches of the US Armed Forces. It is named for Virginia native and Confederate Lieutenant General A. P. Hill. Fort A.P. Hill is one of ten U.S. Army installations named for former Confederate generals.

HMAS Penguin is a Royal Australian Navy (RAN) base located at Balmoral on the lower north shore of Sydney Harbour in the suburb of Mosman, New South Wales. Penguin is one of the RAN's primary training establishments, with a responsibility for providing trained specialists for all areas of the navy. The current commander of Penguin is Commander Bernadette Alexander, RAN.

Royal Air Force Ibsley or more simply RAF Ibsley is a former Royal Air Force station in Hampshire, England. The airfield is near the village of Ibsley, about 2 miles (3 km) north of Ringwood and about 85 miles (137 km) southwest of London. A perimeter track with three runways were laid out and 18 fighter pens allowing 46 fighters to stand in relative safety. Several Blister and two Bellman hangars were built and ten dispersed accommodation sites were laid out to the north for the airmen & women. A double cupola Battle Head Quarters, two Control Towers

The Japanese Coastal Defense Gun near Songsong on Rota in the Northern Marianas Islands, is a historic site that is listed on the U.S. National Register of Historic Places. The gun emplacement was built by the Japanese military in 1941. It was listed on the National Register in 1984.

Marine Corps Base Camp Lejeune is a 246-square-mile (640 km2) United States military training facility in Jacksonville, North Carolina. The base's 14 miles (23 km) of beaches make it a major area for amphibious assault training, and its location between two deep-water ports allows for fast deployments.

Kristiansand Cannon Museum is a museum at Møvik, 8 kilometers west of the town centre of Kristiansand, Norway. The museum has collected authentic equipment from a former military installation.

Naval Air Station Corpus Christi is a United States Navy naval air base located six miles (10 km) southeast of the central business district (CBD) of Corpus Christi, in Nueces County, Texas.

Quonset Point Air National Guard Station is the home base of the Rhode Island Air National Guard 143d Airlift Wing. Naval Air Station Quonset Point was a United States Naval Base in Quonset Point, Rhode Island that was deactivated in 1974. Next to NAS Quonset Point was Camp Endicott at Davisville, home of the Naval Construction Battalions known as the Seabees. Quonset Point also gave its name to the Quonset hut, a standardized temporary structure used by the U.S. military starting in World War II. Former US President Richard M. Nixon went through basic naval officer training at Quonset Point in 1942.

Fort Polk is a United States Army installation located in Vernon Parish, approximately ten miles east of Leesville, Louisiana, and thirty miles north of DeRidder in Beauregard Parish, Louisiana.

The Quabbin Reservoir is the largest inland body of water in Massachusetts, and was built between 1930 and 1939. Today, along with the Wachusett Reservoir, it is the primary water supply for Boston, some 65 miles (105 km) to the east as well as 40 other communities in Greater Boston. It also supplies water to three towns west of the reservoir and acts as backup supply for three others. By 1989, it supplied water for 2.5 million people, which was about 40% of the state's population at the time. It has an aggregate capacity of 412 billion US gallons (1,560 GL) and an area of 38.6 square miles (99.9 km2).

Ellsworth Air Force Base (AFB) is a United States Air Force base located about 10 miles (16 km) northeast of Rapid City, South Dakota, just north of the town of Box Elder.

Redstone Arsenal (RSA) is a United States Army post and a census-designated place (CDP) adjacent to Huntsville in Madison County, Alabama, United States and is part of the Huntsville-Decatur Combined Statistical Area. The Arsenal is a garrison for a number of tenants including the United States Army Materiel Command, Army's Aviation and Missile Command, the Missile Defense Agency of the Department of Defense, and NASA's Marshall Space Flight Center. RSA has benefited from decisions by the Defense Base Realignment and Closure Commission. The Redstone Arsenal CDP had a population of 1,946 as of the 2010 census. The base contains a government and contractor workforce that averages 36,000 to 40,000 personnel daily.

The former Seneca Army Depot occupied 10,587 acres (4,284 ha) between Seneca Lake and Cayuga Lake in Seneca County, New York. It was used as a munitions storage and disposal facility by the United States Army from 1941 until the 1990s. The Depot was listed in the 1995 Base Realignment and Closure Commission and formally shut down in 2000. The property has since been transferred to the Seneca County Industrial Development Agency, which leases it to Seneca County Economic Development Corp.

Sewart Air Force Base (1941–1971) is a former United States Air Force base located in Smyrna, about 25 miles southeast of Nashville, Tennessee. During World War II, it was known as Smyrna Army Airfield.

Royal Air Force St Angelo or more simply RAF St Angelo is a former Royal Air Force station during the Second World War, located near the village of Trory on the southern tip of Lower Lough Erne, 2.5 miles (4.0 km) north of Enniskillen, County Fermanagh, Northern Ireland; also used by the Royal Navys Fleet Air Arm. The name St Angelo is believed to be taken from the nearby Bishop's house, which was commandeered during the war as the Station Commander's residence; the name also became attached to the airfield.

Tinker Air Force Base is a major United States Air Force base, with tenant U.S. Navy and other Department of Defense missions, located in Oklahoma County, Oklahoma, surrounded by Del City, Oklahoma City, and Midwest City.

Tyndall Air Force Base is a United States Air Force Base located 12 miles (19 km) east of Panama City, Florida. The base was named in honor of World War I pilot 1st Lt. Frank Benjamin Tyndall. The base operating unit and host wing is the 325th Fighter Wing of the Air Combat Command (ACC). The base had a resident population of 2,994 at the 2010 census. In October 2018, Hurricane Michael caused catastrophic damage to the base.

RAAF Base Williamtown is a Royal Australian Air Force (RAAF) military air base located 8 nautical miles north of the coastal city of Newcastle in the local government area of Port Stephens, in New South Wales, Australia. The base serves as the headquarters to both the Air Combat Group and the Surveillance and Response Group of the RAAF. The military base shares its runway facilities with Newcastle Airport. The nearest towns are Raymond Terrace, located 8 km (5 mi) west of the base and Medowie, 6.8 km (4.2 mi), north of the base, which is home to many of the base's staff.

Yucca Army Airfield is a former military airfield located about 1 mile (1.6 km) west of Yucca, in Mohave County, Arizona, United States. It is on the east side of Interstate 40, 25 miles (40 km) south of Kingman. It is now used as a private facility owned by Fiat Chrysler Automobiles named Chrysler Arizona Proving Grounds.