What marked the start of NATO’s transformation from a purely defensive alliance into a large, coordinated, and powerful military force operating beyond its members’ borders...? Mcqs

What marked the start of NATO’s transformation from a purely defensive alliance into a large, coordinated, and powerful military force operating beyond its members’ borders...?

(A) Bombing campaign on Czechs

(B) Bombing campaign on Bosnian Serbs

(C) Bombing campaign on Afghanistan

(D) Bombing campaign on Iraq