Colonel David T. Theisen was commissioned as an Engineer Officer upon graduation from Officer Candidate School Class 5-85, 13 December 1985. His first duty assignment was as Platoon Leader for 16th EN Battalion, B Company, 1st AD, Furth, Germany. | His subsequent duty assignments include: Assistant S4, EN BN, 1st AD, Furth, Germany; Executive Officer, EN BN, 1st AD, Furth, Germany; Civil Engineer, 293rd EN BN, HHC, 18th EN Brigade, Baumholder, Germany; Commander, 293rd/40th EN BN, B CO, 18th EN Brigade, Baumholder, Germany; Battalion S3, 1st EN BN HHC, Fort Riley, Kansas/Bosnia; BN Operations Officer, 1st EN BN HHC, Fort Riley, Kansas; Deputy Commander, 937th EN HHC Combat Group, Fort Riley, Kansas; Battalion Commander, 1st EN BN, Fort Riley, Kansas/Tikrit, Iraq; Director CEHC, 1st EN Brigade; Fort Leonard Wood, Missouri; Commander, 1st MVR Enhancement Brigade, Fort Polk, Louisiana; Assistant Commandant, USAES, 1st EN BDE, Fort Leonard Wood, Missouri. | Colonel Theisen's military education and training includes: Officer Candidate School, Engineer Officer Basic Course, Junior Officer Maintenance Course, Engineer Advanced Course, Combined Arms Services, Staff School, Command and General Staff College and the United States Army War College.