Sieben was twice awarded the Silver Star for gallantry in combat for actions in Germany in November 1944 and March 1945, respectively.

[5][6] In the first such instance, then-Staff Sergeant Sieben and two comrades rescued a severely wounded officer despite "a hail of small arms and mortar fire".

[11] It has also been reported that Sieben's duty during this period of time included service as an intelligence officer in Austria.

[15] In April 1966, Sieben became Inspector General of the Minnesota Army National Guard until his promotion to Military Support Plans Officer in September 1966.

[19] Sieben traveled to Norway in 1998 as part of a Minnesota delegation to celebrate the 25th consecutive year of this exchange.

[21] In his new role, Sieben was responsible for the 13,000 members of the Minnesota Air and Army National Guard.

"[30] Sieben was married to his wife, Charlotte, and had three children, sons James and Terrance, and daughter Lisa.