The B-57 was used in Vietnam as a tactical bomber and for reconnaissance. It was also modified for extreme altitude reconnaissance. At one time the "Canberra" held the world record for sustained altitude, 54,000 feet.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/28567825@N03">Cliff</a> from I now live in Arlington, VA (Outside Washington DC), USA
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/28567825@N03/2834554669/">Martin RB-57A Canberra</a>