The Great War
During the middle stages of the Great War, Alpha Squadron under Duke's command was deployed to Char to retrieve Sarah Kerrigan, who had been abducted by the zerg. Norad III was Duke's flagship during the battle. However, the zerg attacked and defeated the terran fleet, and things weren't made easier when the Protoss Expeditionary Fleet arrived and destroyed most of the terran ships.
Though Duke's fleet suffered great losses during its attacks on Char, Norad III managed to escape.
After the Great War, Norad III led Alpha Squadron to Bhekar Ro, a backwater colony world which had then discovered a xel'naga temple. The Squadron's fleet was destroyed or disabled fighting the protoss and zerg attempting to secure the temple, and temporarily stranding the survivors. Norad III was subsequently repaired and returned to service.
The Brood War
The Dylarian Shipyards
General Edmund Duke led the Dominion Armada to the Dylarian Shipyards from Norad III in a reprisal against the UED Expeditionary Fleet which had commandeered a number of battlecruisers in dry-dock. The Dominion fleet was repelled.
Siege of Augustgrad
With the fall of Augustgrad to the UED, Emperor Arcturus Mengsk attempted to escape aboard Norad III but was headed off by Aleksander. The ship was rescued by Commander Jim Raynor and escaped via dimensional recall along with Hyperion and a small protoss fleet.
The Last Battle
"General Duke. You know I always wanted to have you killed. This is kind of exciting for me."
"Do your worst then, girl. You ain't takin' Edmund Duke without a fight!"
- Duke's last stand(src)
Norad III returned to Augustgrad after the liberation of Korhal, but was ambushed by Sarah Kerrigan's forces shortly after the zerg launched a sneak attack on Mengsk's base of operations. The ship was destroyed and Duke killed.
Norad III is represented by the original Norad II unit in-game, renamed to Norad III. Its stats other than name are unchanged from Norad II in the mission "Emperor's Fall," but it is given different stats in "True Colors." These stats make it the most powerful battlecruiser in the game, eclipsing both Hyperion and Norad II. Within the mission, it is guarded by two fellow battlecruisers.
The Yamato Gun is a powerful weapon that focuses a nuclear explosion into a beam using magnetic fields. It deals 260 damage.
- In Shadow of the Xel'Naga, Norad III was an extensively refitted and renamed Norad II. All of Alpha Squadron's battlecruisers were destroyed during the Battle of Bhekar Ro; if taken to mean the ships were unsalvageable this would preclude Norad III's appearance in StarCraft: Brood War.
- Firstborn stated that merely most of Alpha Squadron's ships were destroyed at Bhekar Ro. This allows Norad III to survive either by reflecting subsequent salvage or by retconning Shadow of the Xel'Naga's battlecruiser statement.
- North American Aerospace Defense Command (NORAD) is a joint Canadian/United States military organization.