Irving L. Branch
... that Irving L. Branch headed the X-15 rocket program and the first test flight of the B-70 Valkyrie supersonic bomber?
... that <b id="mwA6I"><a href="./Irving_L._Branch" id="mwA6M" rel="mw:WikiLink" title="Irving L. Branch">Irving L. Branch</a></b>  headed the <a href="./North_American_X-15" id="mwA6Q" rel="mw:WikiLink" title="North American X-15"><span about="#mwt50" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"X-15"}},"i":0}}]}' id="mwA6U" typeof="mw:Transclusion">X-15</span></a> rocket program and the first test flight of the <a href="./North_American_XB-70_Valkyrie" id="mwA6Y" rel="mw:WikiLink" title="North American XB-70 Valkyrie"><span about="#mwt51" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"B-70"}},"i":0}}]}' id="mwA6c" typeof="mw:Transclusion">B-70</span> Valkyrie</a> supersonic bomber?