AN/PVS-4 mounted on M16A1 rifle
U.S. Army
<a rel="nofollow" class="external text" href="https://babel.hathitrust.org/cgi/imgsrv/download/pdf?id=uiug.30112075628286;orient=0;size=100;seq=479;attachment=0"><i>Infantry Magazine</i></a>, September-October 1974, Vol. 64, No. 5, Page 5