A mobile suit veteran who participated in the first stage of the One Year War, the One Week Battle. During Operation British, Lt. Schmitzer was badly crippled, including weakened vision, and forced to retire his post. The person who wounded him was none other than Ensign Agar, who later develop a rivalry with the Fenrir Corps and would subsequently end up piloting the Gundam Mudrock. However, he would go on to approach Kycilia Zabi to propose the formation of a special mobile suit task force that would become the Midnight Fenrir Corps.
The first operation he oversaw as the commander of the Fenrir Corps was the descent operation to capture an Earth Federation air base in North America. Because of supply issues, he could only send out MCPO. Austin's Zaku I A squad and Lt. Roher's Zaku II squad. The operation was a huge success. Not only did the Fenrir Corps capture the base, they also destroyed a Big Tray-class land warship and recaptured several Zaku II's possessed by the Federation. Following that operation, Schmitzer oversaw the Fenrir's operation to capture California Base and its sub dock and command center. He was on hand in Seattle when Capt. Garma Zabi was betrayed by Char Aznable. Following the death of Garma, he was re-deployed with his unit to the European front in order to try to slow the Federation advance on Odessa. Following the fall of Odessa, he retreated along with the rest of the Zeon forces. The Fenrir participated in the ill-fated invasion of Jaburo and later, the defense of California Base. After the fall of California Base, the Fenrir and Schmitzer fled to Africa, where they saw the end of the war. The Fenrir rendezvoused with the Rommel Corps, however it became clear that they could not get along as Schmitzer expressed how he does not want to carry on the ideals of Gihren Zabi. Despite this, Desert Rommel knew that he could respect Schmitzer as a fellow soldier and trusted the Fenrir to hold back the Federation forces while the Rommel Corps retreat. Once the Rommel Corps had safely retreated, the Fenrir surrendered to the Federation.
- Although he can no longer participate in combat, he still can pilot a mobile suit and often does in training missions with the Fenrir.
- His personal mobile suit is a MS-05S Zaku I painted white and light green. It has a sound analysis system as its sensor due to the fact that he has poor eyesight.
- It is speculated that he may have been a playable character in the campaign at one point or at least appeared in the "Hail Zeon" mission, as Lt. Agar's words after being shot down ("The guy, from that day") seem to indicate that he was shot down by Schmitzer or that he was at least present on the field.