2K Marin's Harley White-Wiedow has detailed The Bureau: XCOM Declassified's first DLC, named Hanger 6, which will be an Xbox 360 exclusive.
"Hangar 6 takes place shortly before Agent Carter’s adventures in the main game, right before the large-scale alien invasion begins. Players will learn that during this time, Agent DaSilva had volunteered for a series of psychic experiments at an undisclosed location known by The Bureau as simply 'Hangar 6'.
"In this DLC, players will take control of Agent DaSilva, and his squad, as they are treated with an elerium-based compound gas in order to visualize and combat the mental defenses of another agent infected with the 'Sleepwalker' pathogen."
Harley says 2K wanted to explore what it was like being a Bureau agent before and during the initial alien invasion and so they turned to Agent DeSilva with the aim of exploring more of his backstory and because the dev team wanted to "up-rez his mustache".
Hanger 6 will be available from October 8th for $4.99. The DLC was first announced in June though its title was not revealed at the time.