Affiliation: Mobile Assault Corps
Upon finishing his higher education courses are the age of 22, he volunteered for the Zeon Defense Forces. After passing through the Military Academy, he would be assigned as a Mobile Suit Pilot in the Mobile Assault Corps.
During the One Week War, he would deploy onto the battlefield piloting a MS-06C as a Master Sergeant. At the Battle of Loum, due to his achievement of sinking three warships, he would be promoted to Captain, and be assigned a MS-06F Zaku II, which then would be painted crimson with black accents, which led it being frequently mistaken as Major Char Aznable's Mobile Suit.
After being promoted to Major, Ridden would receive an MS-06R-2 Zaku II, but in January UC0080 would be transferred to the Ace Corps being formed for homeland defense, and transfer to a MS-14B.
Following this, Maj. Ridden would undergo shakedown training of the MS-14B in the Corregidor shoal zone and take command of the 1st company in the Ace Pilot Corps.
The fierce battle at A Bao A Qu was soon to follow, and though he participated, his activities in the battle remain are unknown. On January 25, UC0080, he was declared missing in action following the battle, subsequently promoted to Lt. Colonel, and discharged from military service.
Source: MSV Vol. 2 : Zeon MS/MA edition KC Deluxe, 2006(Reprint) 1984 (Original)