Undersecretary of Defense for Research & Engineering Heidi Shyu meets with Maj. Grover Smith of the Indiana National Guard during Technology Readiness Experimentation (T-REX) 2023 at Camp Atterbury, Indiana. (Defense Department photo). Pentagon completes second technology experiment for RDER initiative The second Technology Readiness Experimentation 2023 (T-REX 23-2) conducted 11 “full scale assessments” of new warfighting technologies. Oct 27, 2023 By Mikayla Easley