All Close Access domestic (in the US) collection uses the US-3136 SIGAD with a unique two-letter suffix for each target location and mission.
20100910 Closed Access SIGADS 01 (leaked through lemonde.fr 20130922) Tags: US-3136 / US-3137 / BLACKFOOT / HIGHLANDS / VAGRANT / WABASH / PBX / MAGNETIC / OCEAN / LIFESAVER / GENIE / BLACKHEART
