Halo Gamestock 2001 Demo
From Halopedia, the Halo wiki
The demo showcases basic infantry combat against two types of Covenant enemies, the Sangheili and the Unggoy, in both exterior and interior settings. The Master Chief pilots a Banshee and drives a Warthog, the latter of which has a UNSC Marine on the rear turret. At certain points, the camera leaves the first-person perspective to showcase the environment. The track Truth and Reconciliation Suite plays throughout the demo.
The demo begins with the Master Chief flying a Banshee to the Cartographer island on Halo. After flying over the shore, he lands at the beach near the path that leads to the security substation, and climbs into a Warthog with a Marine on the gunner. The Master Chief drives the Warthog to the Cartographer facility, where the gunner fires the M41 Vulcan turret at Sangheili and Unggoy. The Master Chief exits the Warthog and joins the battle with his MA5B assault rifle.
After clearing the entrance, the Chief descends into the underground facility, quietly taking out an Unggoy at the shaft before fighting more Covenant inside. He eventually reaches the deepest level and activates the Cartographer, which displays a three-dimensional hologram of the Cartographer facility.
Changes from the final release of Halo: Combat Evolved