Medium Fusion Destructive Device

The Medium Fusion Destructive Device, or MFDD, is a tactical nuclear weapon with a yield of 63 terajoules (approximately 15 kilotons TNT equivalent), used by the United Nations Space Command. It was manufactured by Misriah Armories.

An MFDD was used by Noble Team to destroy a CCS-class Battlecruiser during a battle on an unspecified human colony world during the Human-Covenant War.

Trivia

 * The concept art of the MFDD shows framework attached to the underside of the device, while the prop in the trailer has this framework removed. This was for the purpose of making the prop easier to carry around during acting.
 * The MFDD was designed by Bungie's veteran concept artist Isaac Hannaford.
 * In a radio conversation heard on the map Glacier, one of the two ONI agents involved suggests killing Dr. Catherine Halsey with a MFDD to prevent her from interfering with their secret op, and to erase any recognizable remains.

List of appearances

 * Halo: Reach
 * Deliver Hope