Armbrust 300, the initial variant of the well-known German rocket launcher, clearly different in visual appearance and certain visually-recognizable features from its latest variants
U.S. Department of Defense
<a rel="nofollow" class="external text" href="https://babel.hathitrust.org/cgi/imgsrv/download/pdf?id=uiug.30112106757302;orient=0;size=100;seq=109;attachment=0"><i>Military Review</i></a>, August 1972, Vol. 52, No. 8, Page 103.