the game would be about how it was like to live as a tank crewman in ww2 and the game would go from conscription/enlistment to the end of the war(or something else depending on nation and tank selected) the actual game would go from the training of your crew for the tank you chose until the end of the war(or your crews untimely demise if bad decisions are made), this would mean that if you for example chose the panzer iv c as your tank you would use it and it's later variants.
notes: the actual game would be different from here due to scratch moderation song used is "Advance Australia" from war thunder credits: war thunder for almost all tanks in the selection and music(the m3 half-track and sd.kfz. 251/1 are the exeptions, they are from wikipedia)