First of all, the current research system is relatively simple, players can not participate in depth, which will lead to the best tactics(only works), and getting tired quickly.

Therefore, suggested to introduce a custom weapon research system. Instead of conducting research according to a fixed time line and project, the game should provide(base on the historical timeline) various types of engines (diesel engine / gasoline engine, air-cooled / water-cooled), guns (different calibres), and armor types. The players can design and name weapons the weapon by themselves, by take good balance at armor / firepower / movement / price of resources.