[quote=@Pepperm1nts]
Take New Zealand's population (or an estimate of the population around 1980), and find out how much of that total is 10%. That (however many 10% is) is the biggest your military could realistically be. Given New Zealand is not exactly a military powerhouse, though, and that they aren't seriously threatened by anyone, it's likely their total military force is somewhere less than 10%.
[/quote]

Seeing how by then, New Zealand would have a population of 2.5 million. Then it would be around 200,000. Okay. Onto making even more units.