GCS
(1) Generator Control Switch (2) Ground Central Station (3) Ground Combat Systems (4) Ground Communications Segment (5) GCS Ground Control Shelter (6) Ground Control Site (7) Ground Control Squadron (8) Ground Control Station (9) Ground Control Surveillance (10) Ground Control System (11) Guidance Control Section (12) Guidance Control System (13) Gun Computer System (14) Ground Clutter Suppression (15) Guard Channel Simplified Access