Not necessarily. I doubt we need a military in modern day Germany to defend us against our neighbours. Just make sure to have enough cash on hand to hire mercenaries in case of attack.

Modern-day Germany has a military:

http://en.wikipedia.org/wiki/Bundeswehr

Call it a defense force, or a militia, or whatever you will, it's still the German military.

Yes, I am quite aware that modern-day German has an army. And a draft.

I just doubt the Bundeswehr is necessary. (Disclaimer: I was drafted, but refused to serve.)

Two million German civilians have fire arms and they train in their "Schützenvereine". No need for no army or mercenaries.

Small nitpick: "Schützenvereine" are more about drinking beer and having a party ("Schützenfest"). If you want to shoot, join a "Schießverein".

Costa Rica has no army and fares very well without it in stark contrast to the nations around them: http://news.bbc.co.uk/2/hi/americas/3929177.stm Just educate yourself.

Perhaps the education can go both ways:

http://en.wikipedia.org/wiki/Military_of_Costa_Rica

So, yep, they've still got a military, it's just also their police force (and national guard), which is pretty smart, in my opinion.

Looking up Wikipedia is the opposite of education. Also this entry just confirms what I said. Costa Rica has only security forces with very basic fire arms.