Those "peacekeepers" were an ad-hoc multinational UN force created under the UN Charter to help implement and protect cease-fires in local conflicts.

They were (and are) not combat soldiers, and they fired only if fired upon - if then.

The phrase "United Nations peacekeepers" seems to have supplemented "United Nations peace-keeping force" in the early '60s. Their first deployment was in 1948.

In the 1980s, of course, there were the Peacekeeper ICBMs.

In the spirit of Mutually Assured Destruction, they really were intended to keep the peace.

And, in service from 1986 to 2002, they apparently helped do just that.