Airborne assault (artist's concept)
US Army Air Defense Board photograph
between 1968 and 1969 <div style="display: none;">date QS:P,+1968-00-00T00:00:00Z/8,P1319,+1968-00-00T00:00:00Z/9,P1326,+1969-00-00T00:00:00Z/9</div>
<a rel="nofollow" class="external text" href="http://sill-www.army.mil/ada-online/air-defense-trends/_docs/1969/jan.pdf">Air Defense Trends</a>, January 1969, Page 43, Figure 1