Call of Duty HQ is a central hub for the Call of Duty franchise that aims to put years worth of Call of Duty content all in one place. It is a service that acts as a singular access point for all things Call of Duty, starting with Modern Warfare III and beyond. Call of Duty HQ will house all future Call of Duty games under one roof, making it easier for players to select which game and modes they wish to play). It is essentially a launcher of sorts that allows players to navigate through all of their Call of Duty-related content.
While the name is new, having a hub for multiple Call of Duty games isnt an original concept. For multiple years running, players have been able to access multiple Call of Duty games from the main menu of whatever the latest installment of the franchise is. However, Call of Duty HQ sounds like its taking that to another level with a commitment to house all of the franchises games under one roof going forward.
Call of Duty HQ is not to be confused with the Headquarters game mode, also known as King of the Hill, which is a multiplayer game mode featured in every main Call of Duty game from Call of Duty to Call of Duty: Black Ops).