Star Wars Rogue Leader: Rogue Squadron II

In the 4th mission (Prisons of the Maw) Bomb an environmental dome between the weapons storage building and the communication relays and the upgrade will appear in its place. This upgrade increases the destructive power of cluster missiles, which are a secondary weapon of the Tie Advanced and Slave 1 ships.

The Advanced Concussion Missiles are in the tunnel across from the Spread Proton Bombs in ''Imperial Academy Heist.''

In the Vengeance on Kothlis level, before the transport lands, fly through a small gap in the demolished Star Destroyers command deck to pick up the upgrade. This will allow you to lock on to a target with proton torpedoes.

BATTLE OF HOTH: After the Rebellion's Shield Generator is destroyed by the AT-AT, the Laser Cannon upgrade will appear in it's place.

Right when you enter the second mission (Ison Corridor Ambush), dip down so you can see the piece of debris in front of you. It's hollowed out in the shape of a rectangle with the upgrade in the center.

NOTE: You must complete the mission after collecting the upgrade in order to keep it.