The word operations can derive from the phrase of peacekeeping operations. Which stands for one of the 16 peacekeeping operations. I.E. India and Pakistans disputes would be one of the peace keeping operations. The way operations is used couldnt possibly mean all of the peacekeeping operations, the reason our current literature uses the word Operations with an S at the end only because there are so many. In this case the S doesnt make the word plural which would make more than one operation in this word.
Peacekeeping Operations means one operation not all