From the book: "Lt. Gen Nguyen Chanh Thi, I Corps Commander (left), and Lt. Gen Nguyen Van Thieu, Vietnamese Chief of State, (center) at Da Nang Air Base, South Vietnam, January 1966"
Not stated
<cite class="book" style="font-style:normal" id="Reference-Staaveren-2002">Staaveren, Jacob Van (2002) "Rolling Thunder 50" in    <i> <a rel="nofollow" class="external text" href="http://www.airforcehistory.hq.af.mil/Publications/fulltext/GradualFailure.pdf">Gradual Failure: The Air War Over North Vietnam 1965–1966</a></i> (PDF), Washington, D.C., United States:  Air Force History and Museums Program, pp. p. 249 Retrieved on 28 July 2008. <small></small></cite>