Vietnam Operations Soldiers fire a quad 50 machine gun into the entrance to the An Lao Valley in Vietnam during Operation Pershing in support of the 1st Battalion, 7th Cavalry Regiment, 1st Air Cavalry Division. The mission was to discourage Viet Cong and North Vietnamese troops from entering or leaving the valley. SHARE: Download: Full Size (0.09 MB) Credit: Army photo VIRIN: 210621-A-D0439-050.JPG Photo Gallery