Colonel Pat W. Simpson was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 53-67, 13 September 1967. His first duty assignment was as Platoon Leader, Company B, 3d Battalion, 143d Infantry, Texas Army National Guard (TxARNG). | His subsequent duty assignments include: Platoon Leader/Detachment Commander, Detachment 1, Company B, 3d Battalion, 143d Infantry, TxARNG; Liaison Officer, Headquarters & Headquarters Detachment, 371st Support Battalion (Airborne), TxARNG; S-4, Headquarters & Headquarters Company (HHC), 249th Supply & Transportation Battalion, TxARNG; S-1, HHC, 949th Maintenance Battalion, TxARNG, Fort Worth, Texas; Personnel Management Officer, Field Services Officer, Public Information Officer, and Field Services Officer, HHC, 111th Support Group, TxARNG, Austin, Texas; Auditing Officer/Fiscal, Senior Accounting Officer, Chief, Logistics Programs Division, and Chief, U.S. Property and Fiscal Office (USPFO) Support Section, Headquarters State Area Command (STARC), TxARNG; United States Property and Fiscal Officer for Texas.