This article contains speculation, information which has not been confirmed by a reliable source. The game is still in development, and all information is subject to change.
Calldowns are various items that can be brought in via air-drop to outdoor locations within Firefall. The first example of a calldown is the Thumper.
Other speculated calldowns include the 'LCV' motorcycle.
Most calldowns are unlocked via the Army Tech Tree.
Little else is known about the calldown system.