Members of the 1st Vulcan Combat Team (Provisional), move out on a search and destroy operation in M-113 Armored Personnel Carriers mounting the M-61 20mm Vulcan anti-aircraft gun (the M163 Vulcan Air Defense System) during operational testing.
SP4 F.E. Mitchell, 221st Signal Company (Pic)
<a rel="nofollow" class="external text" href="https://www.fold3.com/image/1/270427939">NARA 111-CCV-50-CC58290 via Fold3</a>