Question: Groom Lake is the official name for a USAF installation that is a detachment of what base? 
Context: Tonopah Test Range (TTR), is a restricted military installation located about 30 mi southeast of Tonopah, Nevada.  It is part of the northern fringe of the Nellis Range, measuring 625 sqmi .  Tonopah Test Range is located about 70 mi northwest of Groom Dry Lake, the home of the Area 51 facility.  Like the Groom Lake facility, Tonopah is a site of interest to conspiracy theorists, mostly for its use of experimental and classified aircraft.  As such, it is not the focus of alien enthusiasts, unlike its neighbor.  It is currently used for nuclear weapons stockpile reliability testing, research and development of fusing and firing systems, and testing nuclear weapon delivery systems.  The airspace comprises restricted area R-4809 of the Nevada Test and Training Range and is often used for military training. Groom Lake is a salt flat in Nevada used for runways of the Nellis Bombing Range Test Site airport (KXTA).  It is located immediately north of the Area 51 USAF installation.  The lake at 4409 ft elevation is approximately 3.7 mi from north to south and 3 mi from east to west at its widest point, and is approximately 11.3 miles in circumference.  Located within the namesake Groom Lake Valley portion of the Tonopah Basin, the lake is 25 mi south of Rachel, Nevada. The United States Air Force facility commonly known as Area 51 is a highly classified remote detachment of Edwards Air Force Base, within the Nevada Test and Training Range.  According to the Central Intelligence Agency (CIA), the correct names for the facility are Homey Airport (ICAO: KXTA) and Groom Lake, though the name "Area 51" was used in a CIA document from the Vietnam War.  The facility has also been referred to as "Dreamland" and "Paradise Ranch", among other nicknames.  The special use airspace around the field is referred to as Restricted Area 4808 North (R-4808N). Gentile Air Force Station was a USAF installation in Kettering, Ohio, named for World War II fighter ace Don Gentile and closed in 1997.  Gentile AFS was the site of the Defense Electronics Supply Center (merged with the Defense Construction Supply Center in Columbus to form the Defense Supply Center, Columbus) and its Defense Automatic Addressing System Center.  In 1994, Gentile AFS became a Defense Finance and Accounting Service Center facility for the Air Force.  After Gentile's closure, the town of Kettering converted the base property into Kettering Business Park. Lockheed "Have Blue" was the code name for Lockheed's demonstrator (i.e., "proof of concept") that preceded the F-117 Nighthawk production stealth aircraft.  "Have Blue" was designed by Lockheed's Skunk Works division, and tested at Groom Lake, Nevada.  The "Have Blue" was the first fixed-wing aircraft whose external shape was defined by radar engineering rather than by aerospace engineering.  The aircraft's plate-like, faceted shape was designed to deflect electromagnetic waves in directions other than that of the originating radar emitter, greatly reducing its radar cross-section.  Two flyable vehicles were constructed, but both crashed during the flight-test program. Seymour Johnson Air Force Base (IATA: GSB, ICAO: KGSB, FAA LID: GSB) is a United States Air Force base located to the southeast of Goldsboro, North Carolina.  The base is named for LT Seymour Johnson, USN, a native of Goldsboro, a Naval Aviator, and a U.S. Navy test pilot who died in the crash of an F4F-3 Wildcat near Norbeck, Maryland, on 5 March 1941.  The base is the only USAF installation named for a naval officer. Niagara Falls International Airport Air Reserve Station (Niagara Falls Air Force Base c. 1955 -1971) is an Air Force Reserve Command military installation operationally-gained by the Air Mobility Command.  It is located adjacent to Niagara Falls International Airport, New York, 4.7 mi east-northeast of Niagara Falls, New York.  The station is the last "federal" USAF installation in the state, the other remaining USAF installations falling under the Air National Guard). Papoose Lake is a dry lake bed located in Lincoln County, Nevada, USA.  The lake lies within the plot of land referred to as the Groom Lake facility (aka Area 51) and is a restricted area.  The lake is located a few miles southwest of the Groom lake facility nestled adjacent the Papoose Range. Groom Lake is the official name of the USAF installation commonly referred to as Area 51. The Groom Range is a mountain range in Lincoln County, Nevada.  It is located within the Nevada Test and Training Range, north of Groom Dry Lake.  The highest point in the Groom Range is 9,249 feet.  The Groom Range is situated 26.6 miles north of the dry Groom Lake.
Answer: Edwards Air Force Base