This is one of three known left.  It was actually found on a old range, and was being used for troops to target.  Luckily it's been restored!
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/13156911@N05">Joe Wentzel</a> from New Kensington, PA, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/joe_wentzel/3788677257/">DSCF0128</a>