A gun crew commander talks to his firebase FDC over the radio while the gunner makes his sightings and another crewman rams a shell into the breech. The 1st of the 21st gun crew is about to fire in support of the Cav's 3rd Brigade fighting in Que Son Province. 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.
