MMAU - Mobile Mechanized Artillery Unit

Here's a sketch for The Gnomon Workshop monthly contest.

"During World War III opposition raided train with parts for new MMAU prototypes called Hercules II. UR - United Republics, opposition to CON - Coalition of Nations, kidnapped CON's finest scientists to use them for helping assembling the prototypes. With their new jet propulsion systems and plasma charged projectles those few prototypes are said to change the course of War.

In this secret warehouse the last of the few tanks are being assembled and prepared for final battle."