Realtive peace aside from
The Gulf War
to name but 3 that NATO was involved in, there were also plenty of civil wars, and other conflicts that NATO did not take part in.
Someone in the military, that just studies the military was on television a few years back. I cannot recall his name or the program. If I am right with his words, at any given time there is more than 20 wars or civil wars going on at any given time. A good point would be Africa, when almost every country has been fighting some type of civil war since independence. Problem of the end of the British Empire, never teach the local population, and design borders in Europe then what really should have been done.