It was designed to tow targets as a secondary mission, but it's design purpose was to conduct photographic intelligence.
The "bulge" is in fact a jettisonable rocket booster, the flame of which can just be seen developing on the extreme right.
Edit: Hi Martin, just seen your light on, still away mate, last I heard you were bound for Kiev.
Last edited by SincoTC; 1st Aug 2012 at 10:01.