Heidi Shyu gets a feel for the size of a future Mobile TAC that is being prepared for integration during Network Integration Evaluation 15.2 at Fort Bliss, Texas, May 14, 2015. Jason Miller, an engineer, and Army Col. Terrece Harris explain the benefits it will provide. At the time, Shyu served as assistant secretary of the Army for acquisition logistics and technology. Today, she serves as the Defense Department’s undersecretary of defense for research and engineering, and chief technology officer.