2nd Bn, 56th Arty, 1966-68 (Source: Richard Tracy) The VHF radio van -- visible in the middle of the previous "overview" photo -- just after relocating from the Old BOC. The van was the hub of the battalion's tactical radio net, but could be used only for voice communications; it could not transmit ADL (automatic data link) signals. You can see the van's whip antennas, a lead to the wire antenna, and a cluster of cables linking the VHF radios to the BOC's internal communications system. [Also see photos # 10 through 12 below.]