Battle of Mombasa
- Main article: Battle of Mombasa
By October 2552, McKenzie was one of the Marines stationed at Diego Garcia. He, along with Staff Sergeant Marcus Banks, Corporal Perez, and the rest of A Company were sent to New Mombasa during the Battle of Earth. While there, they met up with John-117, and with his help, the Marines trapped and destroyed a Scarab walker.
Battle of Installation 05
- Main article: Battle of Installation 05
McKenzie was then evacuated with John and they traveled to Delta Halo aboard the UNSC In Amber Clad. He traveled with Corporal Perez, Sergeant Major Johnson, and Commander Miranda Keyes to the Library to retrieve the Activation Index. When Johnson and Keyes made it to the Index, Johnson called to him and Perez, to which there was no response. This may indicate he is dead, infected by the Flood, or captured by the Brutes, possibly making him one of the Marines John-117 rescued from High Charity. He and Perez may have been killed as there are two bodies on the floor before the Arbiter enters.
- Halo 2 (First appearance)