National Museum of the United States Army

The Defense Threat Reduction Agency (DTRA) is both a defense agency and a combat support agency within the United States Department of Defense (DoD) for countering weapons of mass destruction (WMD; chemical, biological, radiological, nuclear, and high explosives) and supporting the nuclear enterprise. According to the agency's website its mission states that "DTRA provides cross-cutting solutions to enable the Department of Defense, the United States Government, and international partners to Deter strategic attack against the United States and its allies; Prevent, reduce, and counter WMD and emerging threats; and Prevail against WMD-armed adversaries in crisis and conflict." The agency is headquartered in Fort Belvoir, Virginia.

Davison Army Airfield or Davison AAF (IATA: DAA, ICAO: KDAA, FAA LID: DAA) is a military use airport serving Fort Belvoir, in Fairfax County, Virginia, United States.The airfield is located 15 miles (24 km) southwest of Washington, D.C. It was named for noted World War II aviation engineer Brig. Gen. Donald Angus Davison.The airfield provided support for Army One from 1957 to 1976 for presidents Dwight Eisenhower, John F. Kennedy, Lyndon Johnson, Richard Nixon, and Gerald Ford. Its role of support for the presidential helicopter ended in 1976 when responsibility for the helicopter was transferred entirely to the United States Marine Corps. The 12th Aviation Battalion (part of The Army Aviation Brigade, TAAB) now operates Davison AAF and the Pentagon helicopter pad. The battalion's 18 UH-60 Blackhawks including 4 VH-60 models ("Gold Tops") is responsible for priority regional transport for US Army and Pentagon senior leadership.The Civil Air Patrol National Capitol Wing uses a small tower for use during exercises and flights, and bases their four Cessna 172 and 182s there.

Fort Belvoir is a United States Army installation and a census-designated place (CDP) in Fairfax County, Virginia, United States. It was developed on the site of the former Belvoir plantation, seat of the prominent Fairfax family for whom Fairfax County was named. It was known as Camp A. A. Humphreys from 1917 to 1935 and Fort Belvoir afterward. Fort Belvoir is home to a number of significant United States military organizations. With nearly twice as many workers as The Pentagon, Fort Belvoir is the largest employer in Fairfax County. Fort Belvoir comprises three geographically distinct areas: main base, Davison Army Airfield, and Fort Belvoir North.

The Defense Contract Audit Agency (DCAA) is an agency of the United States Department of Defense under the direction of the Under Secretary of Defense (Comptroller). It was established in 1965 to perform all contract audits for the Department of Defense. Previously, the various branches of military service were responsible for their own contract audits. The DCAA's duties include financial and accounting advisory services for the Department of Defense in connection with negotiation, administration and settlement of contracts and subcontracts.

The narrow gauge railway at Camp A. A. Humphreys was a 20 miles (32 km) long 2 ft (610 mm) gauge military railway at what is now Fort Belvoir, Virginia .

Accotink is an unincorporated community in Fairfax County, Virginia, United States. Accotink is located along Accotink Creek within Fort Belvoir.

Aerospace Data Facility-East (ADF-E), also known as Area 58 and formerly known as Defense Communications Electronics Evaluation and Testing Activity (DCEETA), is one of three satellite ground stations operated by the National Reconnaissance Office (NRO) in the continental United States. Located within Fort Belvoir, Virginia, the facility is responsible for the command and control of reconnaissance satellites involved in the collection of intelligence information and for the dissemination of that intelligence to other U.S. government agencies.

Humphreys National Forest was established in Virginia by the U.S. Forest Service on April 10, 1925 with 3,184 acres (12.89 km2) from part of the Humphreys Military Reservation, now Fort Belvoir. On April 11, 1928 the executive order for its creation was rescinded and the forest was abolished.

The Center for Army Analysis (CAA), formerly US Army's Center for Strategy and Force Evaluation, is a US Army organization under the Deputy Chief of Staff G-8 (DCS G-8) which is responsible for analyses that impact the Army at the strategic or institutional level.

Pohick Church, previously known as Pohick Episcopal Church, is an Episcopal church in the community of Lorton in Fairfax County, Virginia, United States. Often called the "Mother Church of Northern Virginia," the church is notable for its association with important figures in early Virginian history such as George Washington and George Mason, both of whom served on its vestry.The present structure was completed in 1774 and underwent significant renovations beginning in 1874 and 1890. It is two stories tall with a hipped roof and modillioned cornice, with an interior of early Colonial Revival design. The church building was added to the Virginia Landmarks Register in 1968 and National Register of Historic Places in 1969.The church's archive includes the original vestry book of Truro Parish, dating to 1732; a 1761 prayer book imported by Washington; and the grave marker of Katherine Popkins, dated 1766, which is the lone surviving stone from the graveyard of the congregation's former location in Colchester. Charles Mason Remey had contracted a family mausoleum on the grounds in 1937, but "the Remeum" became the target of vandalism and was demolished beginning in 1973.

The Woodlawn Quaker Meetinghouse is located at 8890 Woodlawn Road in Alexandria, Virginia, United States. The meetinghouse and its associated cemetery are significant for their role in the Quaker community in this area of Virginia in the mid to late 19th century. The meetinghouse itself is also significant for its Quaker Plain Style architecture. The property was added to the National Register of Historic Places on May 21, 2009, and the listing was announced as the featured listing in the National Park Service's weekly list of May 29, 2009.The original meetinghouse, now the southern half, was built in 1853. The northern half was added between 1866 and 1869. Both halves are wood frame, one story, gable roofed structures. The style reflects the Quaker belief in simplicity and lack of adornment. The rectangular building faces east, with two entrances on the long side of the rectangle. One entrance was for women, and one for men. On the interior, there is a center wall with window-like opening. The openings can be shuttered to accommodate separate meetings for men and women. The seating is historic, simple, wooden benches. The porch that currently wraps around the building was added at a later time. Union soldiers occupied the building during the American Civil War, and carved their names and initials to the right of what was then the only entryway.

Pohick is an unincorporated community in Fairfax County, Virginia, United States. Pohick is centered between the intersections of Rolling and Telegraph Roads with Richmond Highway (U.S. Highway 1). It is adjacent to the communities of Lorton and Newington. Pohick takes its name from Pohick Church which in turn is named for Pohick Creek.