From Halopedia, the Halo wiki
The Teleport is a UNSC-developed armor ability allowing its user to move across the battlefield using slipspace translocation. Sometime after the Battle of Draetheus V this armor ability was used by the SPARTAN-IVs on board the UNSC Infinity for simulations against the Flood. It was also used in 2557 during a Promethean invasion on New Phoenix.
In Spartan Assault, it is used to teleport the player to his teammate. In Spartan Strike, however, the player is transformed into a mote of light and controls where they teleport.
List of appearances