SP/5 Redger 'Lower than whale what?' FDC Dak To April '68. Photo by Earle Smith, 6th Battalion, 14th Artillery Regiment, RVN 1967-68. Typically, there is one FDC for a battery of six guns, in a light division. In a typical heavy division configuration, there exists two FDC elements capable of operating two four gun sections, also known as a split battery. The FDC computes firing data, fire direction, for the guns. The process consists of determining the precise target location based on the observer's location if needed, then computing range and direction to the target from the guns' location. This data can be computed manually, using special protractors and slide rules with precomputed firing data.
Member of the 131st Australian Divisional Locating Battery With a Radar Controlled Detector
A member of the 131st Australian Divisional Locating Battery with a radar controlled detector designed to locate the source of enemy fire. Once the position of, for example, an enemy mortar was detected artillery could zero in on the target.
Soldier Adjusting a Track on an APC Before a Road Trip
Me adjusting a track on an APC (armored personnel carrier) at FDC (fire direction control center) before a road trip. Photo by Barney Rouse, "C" Battery, FDC, 6th Battalion, 14th Artillery Regiment, RVN 1966-67.