Nov. 16, 2021 21st CES renovates the CO Thirty Group track The 21st Civil Engineer Squadron has completed initial work to restructure the Colorado Thirty Group track, a dirt running track at Peterson Space Force Base, Colorado, Oct. 20, 2021, .
June 27, 2018 21 CES holds open house for families of Airmen – Firetrucks, a barbecue cook-off, a bounce house and robots was the 21st Civil Engineer Squadron’s recipe for success at their first open house at Peterson Air Force Base, Colorado, June 13, 2018.