A powerful Robotech beam weapon that often takes up a significant amount of space and resources of the ship carrying it. Large firing booms are required to build up its destructive force that is comparable in effect to nuclear weaponry. The largest functioning unit ever constructed was the Grand Cannon in Alaska.
It was later superseded by the more compact and efficient Synchro Cannon.
A Zentraedi scout ship is instantly destroyed by a blast from the SDF-1's Reflex Cannon.