A Bell UH-1D <i>Huey</i> of No. 9 Squadron RAAF, used to support the 2nd Battalion, Royal Australian Regiment in Vietnam, 1970.
USAF
<a rel="nofollow" class="external text" href="http://www.afhso.af.mil/">U.S. Air Force Historical Studies Office</a> publication <a rel="nofollow" class="external text" href="https://web.archive.org/web/20161123172101/http://www.afhso.af.mil/shared/media/afhistory/tactical_airlift.pdf">Tactical Airlift (AFD-101013-035)</a> p. 414.