Mobile Suit Gundam Battlefield Record: Avant-Title
Kidou Senshi Gundam Senki: Avant Title
機動戦士ガンダム戦記 アバンタイトル
A short animation serving as a prequel to the events depicted in the PlayStation 3 game, Mobile Suit Gundam: Battlefield Record U.C. 0081.
(Source: AniDB)