Major Sheldon H. Foss was commissioned an Artillery Officer upon graduation from Officer Candidate School Class 18-49, Fort Riley, Kansas, 19 December 1949. His first duty assignment was Forward Observer, C Battery, 537th Field Artillery Battalion, Camp Carson, Colorado. | His subsequent duty assignment include: Assistant Executive Officer, 11th Prov Artillery Battery, Camp Carson, Colorado; Assistant Executive Officer; C Battery, 64th Field Artillery Battalion, RECOM; PW, Korea; Commander, Headquarters Detachment Section, Headquarters Command, 5022 ASU, Camp Carson, Colorado; Battery Commander, Headquarters Battery, 97th Field Artillery Battalion, Fort Carson, Colorado; Battery Commander, Headquarters, 97th Field Artillery Battalion (Headquarters Btry), USAREUR; Headquarters Battery Commander, Headquarters Battery, 97th Field Artillery Battalion, USAREUR; Battalion Commo Officer, Headquarters Battery, 94th AAA Battalion (AW) (S), USAREUR; Battalion, Commo Officer, Headquarters, 5th AW Battalion (SP), 4th Artillery, USAREUR; Comm Pro & Crypto Instructor, Gen, Dept Commo & Elct, Headquarters USA Arty & Mal School, Fort Sill, Oklahoma; Artillery Advisor, Fifth USA ADGRU (ARNG), Denver, Colorado.