[quote=@Willy Vereb] Yup, that's more or less what I said to him. I don't mind if he raises the tech limit but then the rule against jet fighters may look almost silly. Plus it gives you less means to upgrade your tech later. WW2 had a rather interesting escalation in arms. So even if it's a bit of pain I try to highlight all these issues and then leave [@Voltus_Ventus] to decide what to do with them. [/quote] I think I'll put the the time period to the mid 1940's 44-47 maybe, as it seems that all the technology we have is semi encompassed in that era.