Mr. John Diem

Mr. John Diem was selected to the Senior Executive Service in November 2017 and is the Executive Director of the US Army Operational Test Command (USAOTC), headquartered at Fort Hood, Texas with test directorates at Fort Bliss, TX; Fort Bragg, NC; Fort Hood, TX; Fort Sill, OK; and Fort Huachuca, AZ. A subordinate command to the US Army Test and Evaluation Command (ATEC), the US Army Operational Test Command plans, conducts, and reports the results of rigorous operational tests, assessments and experiments to provide effectiveness, suitability and survivability information for the acquisition and fielding of warfighting systems. Mr. Diem’s professional areas of emphasis are modeling and simulation integration and interoperability, mission command systems testing and training, and technology development and acquisition.