The CSTR concept began as the Civil Engineer Regional Training Site initiative under the Department of the Air Force Directorate of Civil Engineers in 2018. Between 2018 and 2022, the Air Force Civil Engineer Center expanded existing Silver Flag and Air Reserve Component RTS sites and established contingency training locations at Joint Base Elmendorf-Richardson, Alaska; RAF Feltwell, England; Mountain Home AFB, Idaho; and Nellis AFB, Nevada.
During this same period, the Security Forces enterprise greatly expanded the capabilities of the Desert Defender Ground Combat Readiness Training Center and modernized the curriculum to improve pre-deployment training skills and readiness for Security Forces Airmen. Recognizing the need to expand these concepts even further, AFIMSC began working in 2022 to develop CSTR sites and prove their effectiveness for unit-led combat support and combat service support training events.