From Halopedia, the Halo wiki
Camp Hathcock was a facility utilized by the UNSC, and located on the northern continent of the planet Reach. Nestled in the Highland Mountains, Camp Hathcock was a top-level retreat; heads of state, VIPs, and top brass were the facility's normal occupants, along with a division of veteran, battle-hardened Marines.
The inner compound of the facility was protected by encircling fences and razor wire. The outside of the facility was designed to look like a large wooden cabin. The inner walls of the camp were lined with Titanium-A armor plating and it contained bunkers and plush conference rooms that were hundreds of meters underground, beneath a mountain.
During the training of the SPARTAN-IIs, the trainees often covertly ventured into the camp for food and supplies. Following the Battle of Sigma Octanus IV, on August 12, 2552, several participants were debriefed at Camp Hathcock. A committee was formed in Sub-basement III's conference room for the debriefing. Corporal Harland was one of the individuals debriefed by the committee. John-117 was questioned about the Huragok and Mgalekgolo that he encountered at Sigma Octanus IV and the artifact that was destroyed by a HAVOK tactical nuclear weapon. Later, John met with Dr. Catherine Halsey and she informed him of an upcoming, important assignment. Captain Jacob Keyes was also debriefed at the camp about the intercepted Covenant transmission and is assigned command of the UNSC Pillar of Autumn.
It is likely that the camp is named after Carlos Hathcock, a legendary sniper from the Vietnam War.
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