Of possible interest, the Soviet Union had a number of military space stations. The Almaz project culminated in a Salyut analogue that actually had a 20mm cannon that was test fired in orbit.
In the 1980s, they built the Polyus Space Battlestation (http://en.wikipedia.org/wiki/Polyus_(spacecraft)) which was to be equipped with nuclear mines, a boron field generator, frickin' laser beams, cannons, etc. As part of a last gasp effort to regain relevancy by showing command of the sky, a test battlestation was launched on one of the two Energia boosters that flew. A funny thing happened on the way to orbit, though...
Because of CG issues, the battlestation (about as big as a US space shuttle) was mounted upside down on the booster. Once it separated from the Energia, it was designed to fire a thruster that would turn it 180 degrees, stop rotation, then the final stage would boost this Cyrillic emblazoned death star into orbit.
The Energia booster completed it's cycle, the explosive bolts detonated, and the Polyus slowly pulled away. A thruster at the bottom fired, and the ponderous bulk began to rotate. With steady precision, it rotated 90 degrees, 135 degrees, then finally 180 degrees.... ....and kept rotating. As it completed a _complete_ rotation, the rocket fired again and smartly placed it back in the exact same angle it had been when it started.
The rocket fired as scheduled, but unfortunately for this military menace, the effect was the opposite intended. With typical maniacal mechanical thoroughness, the rocket ran, slowing the station and neatly dropping it into the Indian ocean.
I've heard rumors (for what that's worth) that one of the US Nuclear subs equipped for deep sea salvage just happened to be in the area at the time. If true, that's the goddamndest thing...
Nonetheless, it's interesting to speculate about what might have happened in the end-stages of the Cold War if the Soviets had gained control of the high ground in this fashion.
An aside, a great site for learning more about the military efforts in space during the 60s and 70s is Cold Orbits: http://www.deepcold.com/