Air Force Plant Peter J. Kiewit and Sons (AFP PJKS, AFP #79) is a Formerly Used Defense Site (CO7570090038) at the Colorado Front Range and used during the Cold War (1957-1968) to provide "rocket assembly, engine testing, and research and development") for the Titan missile complexes southeast of Denver (construction began April 1959). The 464 acres (188 ha) of former "Martin Missile Test Site 1" was "deeded" to the USAF in 1957, was subsequently operated by the builder (Glenn L. Martin Company), was listed on the EPA's National Priorities List on November 21, 1989; and remained USAF property until transferred to Lockheed Martin in February 2001. The site is used by, and entirely within, the secure Lockheed Martin/United Launch Alliance Waterton Canyon facility of 5,200 acres (2,100 ha) th