November 1960 Runway 14/32 was completed. The A-12 required a runway at least 8,500 feet long and 150-feet-wide. A 10,000-foot hard asphalt extension, with a concrete turnaround pad in the middle, cut diagonally across the southwest corner of the lakebed. A semicircle (called "The Hook") approximately two miles in diameter was marked on the dry lake so that an A-12 pilot approaching the end of the overrun could abort to the hard-packed playa instead of running his aircraft into the sagebrush.
An unpaved airstrip (Runway 09/27) crossed the lakebed from southwest to northeast. Another strip (Runway 03/21) was laid out as a crosswind runway.
August 1961 The essential facilities at Area 51 were completed. Three surplus U.S. Navy hangars were obtained, dismantled, and erected on the north side of the base, just north of the three original hangars. They were designated as Hangars 4, 5, and 6. A fourth, Hangar 7, was also built.
One hundred and forty surplus U.S. Navy housing units were transported to the base and made ready for occupancy. The original U-2 hangars now served as maintenance and machine shops. Facilities in the main cantonment area included workshops and buildings for storage and administration, a commissary, control tower, fire station, and housing.
The airspace over Groom Lake became part of a new Restricted Area called R-4808N (replacing the former Prohibited Area P-275), that covered both the Nevada Test Site and Area 51. It prohibited overflights below 60,000 feet.
September 1961 CIA Inspector General Lyman B. Kirkpatrick arrived at Area 51 for a three-day visit. Afterward, he had some critical comments regarding Area 51 security and OXCART project management.
In his preliminary summary report Kirkpatrick stated: "The 'Area' in my opinion appears to be extremely vulnerable in its present security provisions against unauthorized observation. The high and rugged northeast perimeter of the immediate operating area, which I visited in order to see for myself, is not under government ownership. It is subject to a score or more of mineral claims, at least one of which is visited periodically by its owner. Several claims are sites of unoccupied buildings or cellars which together with the terrain in general afford excellent opportunity for successful penetration by a skilled and determined opposition."
Kirkpatrick felt that Area 51 was "already demonstrably vulnerable to air violation including landings," that "major installations are not rigorously protected against sabotage," and that construction of facilities had been undertaken before construction personnel had received a full security clearance.
Richard M. Bissell thought these points were valid. The assistant to the CIA Deputy Director of Plans noted that Bissell "was particularly interested in why we have not yet been able to eject the various citizens holding property around the Area."
December 1961 Col. Robert J. Holbury was named commander of Detachment 1, 1129th Special Activities Squadron Roadrunners and Area 51, with Werner Weiss of the CIA as his deputy.
January 1962 The Federal Aviation Administration (FAA) expanded the restricted airspace above Groom to 22 by 20 nautical miles. The lakebed now lay at the center of a 440-square-mile box at the heart of the Nellis Air Force Range. Eventually, the airspace was restricted continuously,