I'm most active on the Norwegian Wikipedia.
Here on Commons I've contributed a few of my own photos, and a lot of material I've dug up from the US military web sites. I have decided to release most of my own work as Public Domain, as a gift to the world. I couldn't make a living as a photographer, anyway... :)
Please, oh, plase will somebody make some better replacements! I'm an engineer, not an artist...
Gatling gun mechanism