Boeing Vertol YHC-1A (YCH-46C) helicopter of the United States Army.
Unknown U.S. Army photographer
circa 1960 <div style="display: none;">date QS:P,+1960-00-00T00:00:00Z/9,P1480,Q5727902</div>
Image from <a rel="nofollow" class="external autonumber" href="https://www.helis.com/h/yhc-1a_85516.jpg">[1]</a> credited to U.S. Army Aviation Museum