The Copperhead. From the source: <i>This high explosive anti-tank projectile was fired from a standard 155mm howitzer. Once fired it homed in on reflected laser light which was beamed onto the target by a forward observer. Developmental testing was done at White Sands. U.S. Army</i>
White Sands Missile Range Museum
<a rel="nofollow" class="external text" href="http://www.wsmr-history.org/copperhead.htm">Copperhead</a> from <a rel="nofollow" class="external free" href="http://www.wsmr-history.org/">http://www.wsmr-history.org/</a>