Gundam: Lost War Chronicles

The One Year War between the Earth Federation and the Principality of Zeon has begun–and the newest Mobile Suits are tested for battle!
Captain Matt Healy leads his team into dangerous territory as the leader of a Special Forces Experimental Unit. Ken Bederstadt is a Foreign Legion Lieutenant working in alliance with Zeon. These two heroes are trying to keep everyone alive… for tomorrow!

Notes:

• There are 3 editions of this manga, a 2003 edition and a 2005 "complete" edition with 2 additional chapters - a prequel and a conclusion to the storyline. The version done by HobbyJapan is the 2003 edition.
• Alongside all Matsumoto's Gundam-related titles the series was later recompiled into a new Shinsouban edition, now labeled as Kidou Senshi Gundam Senki REBELLION - Lost War Chronicles