For RP purposes my nation has 16 million people.
Militarily, the standing military forces amount to a 10th of the population, 1,600,000 with a substantial amount of the civilian population trained due to an Opt Out national service and a Jingoistic national attitude.

The Irish Marchlands Factbook
Wars
War of Lebourean Liberation - Result: Co-alition victory, regime change, end to genocide, religious freedom guaranteed for all the people of Leboure
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