The request for artillery fire has been received and fire direction center (FDC) personnel work to plot the fire mission. An FDC artilleryman used the field artillery digital computer to produce and double check the fire mission data. The information is then radioed to the battery which has been picked to deliver the high explosive support to ground troops in contact with the enemy. Source: The First Air Cavalry Division, Vietnam, Volume 1, 1965-1969. Note: This is an undated photo but the tour book covers the period from 1965 to 1969.
