Among other things, Söder was platoon leader in Neumünster and company commander in Flensburg and Bad Segeberg. From 1963 to 1965 he completed the general staff course (H) at the leadership academy of the Bundeswehr (FüAkBw) in Hamburg. He also attended Staff College Camberley and the United States Army War College (USAWC) in Carlisle, Pennsylvania.  In 1974, he was head of the army main connecting rod 1 in Fort Monroe / Washington. Among other things, he was the commander of the 173rd Panzer Grenadier Battalion and, as a colonel , became the commander of the 17th Panzer Grenadier Brigade in Hamburg on April 1, 1980 . This was followed by a position as head of department in the command staff of the armed forces (Fü S) in Bonn from April 1, 1982 to March 31, 1984, before he became commander of the 7th Panzer Division in Unna on April 1, 1984 .  Exactly two years later, on April 1, 1986, he became commander of the command academy of the Bundeswehr in Hamburg.  After April 1 1988 to March 31, 1991 Commanding General of I Corps in Münster was  , he was deputy commander of 1991/92 Allied Forces Baltic Approaches (BALTAP) in Karup (Denmark) and last from 1992 to 1995 German military representative in the NATO military committeein Brussels (Belgium). In 1995 he was passed with a big tattoo by Defense Minister Volker Rühe . 
Söder is widowed and has one child.
- Photo , leadership academy of the Bundeswehr
- Politik et Militar , S. 155.
- human point of view . In: Hamburger Abendblatt , March 20, 1986.
- Panzergrenadierbrigade 17 1956-1993 (BH 9-17). Federal Archives, accessed on August 8, 2020 .
- 7th Panzer Grenadier Division 1958-1993 (BH 8-7). Federal Archives, accessed on August 8, 2020 .
- Former commanders of the command academy , command academy of the Bundeswehr.
- I. Corps 1965-1990 (BH 7-1). Federal Archives, accessed on August 8, 2020 .
- The loyalty of a Hanseatic . In: Hamburger Abendblatt , March 28, 1995.
- Aufsichtsrat, Hamburg Airport.
|SHORT DESCRIPTION||German Lieutenant General of the Bundeswehr|
|DATE OF BIRTH||October 22, 1934|
|PLACE OF BIRTH||Hamburg|