M990 Electrothermal-Chemical Smoothbore Cannon

The M990 Electrothermal-Chemical Smoothbore Cannon is a United Nations Space Command armament that is mounted on the M820 Main Battle Tank.

Overview
Introduced into service in 2557, the M990 ETCSB cannon fires a much larger 150mm round compared to the M512 cannon's 90mm round. The cannon is capable of firing experimental rounds with energized propellants and guided munitions. Scorpions used by ONI use experimental munitions, while Hannibal Weapon Systems has developed a testbed Scorpion using an experimental fast discharge 150mm plasma cannon. While effective against penetrating heavy armor on land vehicles like the Wraith, it is less effective against nimble aerial targets such as the Banshee and Phaeton. Nonetheless, it can still penetrate through the armor of these targets with ease.

List of Appearances

 * Halo 5: Guardians