The FF-X7-Bst Core Booster is a space and atmospheric fighter featured in the Mobile Suit Gundam II: Soldiers of Sorrow and Mobile Suit Gundam III: Encounters in Space compilation movies.
The FF-X7 Core Fighter was a high-performance, multi-purpose fighter with a great deal of versatility. This was due to its main computer, which had more than ten times the processing power as those used by other aircraft. However, due to its small size, it was limited by its weak armaments and low fuel capacity. The Core Booster, an attachment to the Core Fighter, was intended to solve these problems. The Booster unit was developed based on the data of the G-Sky and the G-Sky Easy. However, while the G-Sky was a fighter-bomber, the Core Booster was a pure fighter.
In addition to the Core Fighter's 25mm Machine Cannons, the Booster was equipped with two beam cannons powered by the reactor, granting it significant firepower when docked. Since the Core Fighter's wings were folded when docked with the Booster, its missile launchers were unusable.