KIDOU SENSHI GUNDAM MS BOYS: BOKUTACHI NO ZEON DOKURITSU SENSOU

Universal Century, October 0079. Kurt Blatt volunteered for the Principality of Zeon forces and with the sergeant Alexei were assigned to the engineering battalion. They believed that Zeon would win but have just been through the Battle Of Odessa.
(Source: Gundam Wikia)