Relocation of a Fire Support Base: Members of Btry &quot;A&quot;, 4th Bn, 42nd Arty, 2nd Bde, 4th Inf Div at Fire Support Base &quot;Challenge&quot;, prepare to load equipment aboard a UH-1D helicopter for movement to Fire Support Base&quot;Navel&quot; c. April 1970. (Photo by Sp4 Joel M. Shanus/U.S. Army/National Archives)