This rocky mountain area was a place where the Spartan-II soldiers trained in a unit cohesion. They were all given a piece of a map and decided to set up a meeting place. They made their way to an extraction point and were forced to almost kill a squad of Marines in order to reach, and then commandeer a Pelican dropship. After this mission, Chief Petty Officer Mendez promoted John-117 to squad leader.
During the Battle of Reach, Spartan Red Team crashed in the forest after their Pelican was shot down. After taking numerous casualties and losing much of their equipment, the Spartans departed from the preserve on their mission. The forests of the Preserve were subsequently burned down during the partial glassing of Reach.
The Training Preserve contained thick Douglas Fir forests and trampled fields. The preserve was apparently home to at least one pack of wolves, which Chief Mendez warned the Spartans about before deployment, as well as an unnamed species of an owl.