Original size: 5000 x 2000 pixels AVAILABLE FOR PRINT.
My entry for the November 2011 Gnomon Workshop forum challenge.
This month the theme was: MMAU; Mobile Mechanized Artillery Unit.
I imagine DARPA will have something like this in a theater of war in the next 50 years; if humanity survives that long.
*EDIT* I tweaked the sky a bit. Wasn't happy with how it looked. Added more detailed cloud cover. Now I'm done.