Lieutenant Walker
Lieutenant Walker served under Zechs Marquise at some point before the beginning of the show. During the show, he met Zechs at the Corsica base, where he showed Zechs the Gundam Tallgeese, and told him to keep it. At the end of the only episode he appeared in, Walker sacrificed himself to save Commander Bonaparte, and for 'the soldiers of the future.'

Ah, hara-kiri.