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In a move toward sweeping acquisition reform, the U.S. Army officially redesignated the Program Executive Office Simulation, Training and Instrumentation (PEO STRI) as the Capability Program Executive Simulation, Training, Test and Threat (CPE ST3). This name change, effective February 12, 2026, reflects a broader mission scope aimed at maintaining technological superiority against peer competitors.
The redesignation is not merely a branding update; it signifies a structural shift in how the Army acquires training and testing technologies. Lee James III, the deputy capability program executive, stated that the new structure is designed to deliver mission-critical systems faster than ever before. By including "Test" and "Threat" in the title, the Army is acknowledging the need to test equipment against realistic, high-tech adversary simulations.
The organization will now have a more direct role in ensuring that new weapons systems are tested in environments that mimic the complexity of modern warfare. This includes the use of digital twins and advanced simulations that can predict how a system will perform before it ever reaches a physical range. The goal is to reduce the time spent in the testing phase, which has historically been a bottleneck for new technology.
Under the new CPE ST3 banner, the office will continue to manage the Army’s vast portfolio of training simulators, but with a renewed focus on "threat-based" training. This means that soldiers will be trained against simulations that reflect the specific tactics and technologies used by current adversaries. It is a pivot away from general training toward highly specialized, data-driven readiness.
Despite the name change, subordinate project manager and lead offices will retain their current missions but will be realigned over the coming months. The Army expects this transition to be seamless, with digital platforms and signage being updated immediately. This reform is part of the "Learning at Speed" initiative intended to make the Army’s acquisition process as dynamic as the battlefield itself.
Redesignation of PEO STRI to Capability Program Executive Simulation, Training, Test and Threat (CPE ST3).
Expanded mission to include advanced testing and realistic threat simulation.
Integration of "Digital Twins" and high-fidelity simulations to speed up acquisition.
Focus on delivering mission-critical training systems faster to counter peer competitors.
Strategic alignment with the Army’s "Learning at Speed" acquisition reform initiative.
The original PEO STRI was established to provide the Army with the tools necessary for realistic training, ranging from virtual flight simulators to laser-based engagement systems. For decades, it was the leader in military simulation, but as warfare moved into the digital and cyber realms, the old "instrumentation" focus began to feel outdated.
By 2025, the Army recognized that testing and threat simulation were inextricably linked to training effectiveness. This led to the decision to consolidate these functions under one executive umbrella to ensure that what we test is what we train for.
1950s: Origins of Army simulation with early flight trainers.
1990s: Formation of PEO STRI to centralize training and instrumentation.
2022: Introduction of the Synthetic Training Environment (STE) for soldier readiness.
2025: Acquisition reform mandates a shift toward "threat-informed" development.
2026: Official redesignation to CPE ST3 to reflect expanded testing and threat missions.