Phantom Bullet: Gundam Secret Weapon

On December 4, U.C. 0082, Anaheim Electronics's Livermore plant was attacked by what was believed to be a group of Zeon Remnants via artillery fire. In response, AE deployed their latest prototype, the RX-78GP00 Gundam "Blossom", to assist the Earth Federation Space Force in hunting down the perpetrators. The GP00 was piloted by test pilot Jack Bayard, who complained that the prototype was difficult to balance due to its heavy equipment and lack of tuning. (Source: Gundam Wiki)