2nd Bn, 56th Arty, 1966-68 (Source: Richard Tracy) Left to right, you can see the IFC's generator shed, TRR (Target Ranging Radar), the top of the TTR (Target Tracking Radar), the CDG (Coder-Decoder Group -- with white stars on the shelter! -- hanging precariously out over the back of its truck), the ICB (Interconnecting Corridor Building), the M&S (Maintenance and Supply) trailer, the BCT (Battery Control Trailer), and the LOPAR (LOw - Power Acquisition Radar). The two tall poles are lightning rods; the others are for the camo nets.