COS airport shares its runway with Peterson AFB. Peterson is one of FIVE military installations in the COS area:
Fort Carson (Army) - 4th Infantry Division (Mechanized) (coming in from Ft. Hood, TX) and the headquarters of the second and third battalions of the 10th Special Forces Group
Peterson Air Force Base - headquarters of the majority of Air Force Space Command and headquarters of the majority of Air Force Space Command
Schriever Air Force Base - 50th Space Wing, GPS master control station, GPS Operations Center, US Naval Observatory Alternate Master Clock, national missile defence control center
NORAD (Cheyenne Mountain Air Station) - control shifted to Peterson but CM is still on hot standby and has backup command & control for much of the satellite fleet
United States Air Force Academy