Illustration done for the G.E.R.C.M. (German Colonial Marines) a group based on the Aliens movie fictional military. The style resemblances the nose art on airplanes from the Vietnam War (as director James Cameron did as well for the ALIENS movie).
As normally, I started with black & white concepts, all the time coordinated with the client, for developing a concept as closest as possible to what was intended. Many ideas were approached, here some of them:
The last option was chosen, and refined till its Final Art style: