JSchoolboy wrote:
And once he has the army men, be prepared for huge battle scenes that must not be disturbed.

Oh yes, certainly. The battle of Stalingrad lasted six months, so recreating it in less than a month would simply be impossible. And when you've spent an entire week moving your armored reserves forward to outflank the carelessly deployed field guns, eventually leading to a breakout, encirclement and victory, well, disturbing this process will result in THE MOST MASSIVE MELTDOWN IMAGINABLE! Okay, games like that are probably a bit hardcore for a seven year old but if I'm playing one of those hex wargames, the ones four foot across and with 300 counters a side, it'll be set up for at least a month. Something to look forwards to in the teenage years
Another thought, if WW2 is too unpleasant, trying getting him interested in another conflict. Cold war is particularly apt since it never actually happened. Modern armour is fairly interesting, not as much variation as WW2 but still some impressive kit. If he need convincing, there's any number of videos of such matters on Youtube. I wouldn't try WW1 as way too bloody, Napoleonics and America Civil War I've never enjoyed but could be worth a shot. Medievals and Romans worth a shot, less militarily interesting but the history is much less unpleasant, especially since it is much more distant. Of course, if he's really into WW2 then there's nothing you can do.
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'An ideal of total self-sufficiency. That secret smile may be the Buddha's but it is monstrous seen on a baby's face. To conquer craving is indeed to conquer pain, but humanity goes with it. That my autistic daughter wanted nothing was worst of all.' Park