Lieutenant General Gustaf Peder Wilhelm Dyrssen was a Swedish Army officer and Olympic modern pentathlete. Dyrssen had an extensive and distinguished military career, starting as a second lieutenant in the Svea Artillery Regiment in 1912. Over the years, he rose through the ranks, serving in various capacities, including as a captain in the General Staff and as the commander of the Svea Artillery Regiment. His career highlights include being appointed major in 1934, major general in 1944, and eventually serving as the military commander of the IV Military District and the Commandant General in Stockholm from 1945 to 1957. Dyrssen retired from the Army in 1957 but continued as lieutenant general in the reserve.

Eastern Military District, originally IV Military District was a Swedish military district, a command of the Swedish Armed Forces that had operational control over Eastern Sweden, for most time of its existence corresponding to the area covered by the counties of Östergötland, Södermanland, Stockholm, Uppsala and Västmanland. The headquarters of Milo Ö were located in Strängnäs.