Military operation and Peacekeeping mission

Military operation noun - Activity by a military or naval force (as a maneuver or campaign).

Peacekeeping mission and military operation are semantically related. In some cases you can replace phrase "Peacekeeping mission" with "Military operation", this phrases are similar.

Peacekeeping mission noun - The activity of keeping the peace by military forces (especially when international military forces enforce a truce between hostile groups or nations).

Military operation and peacekeeping mission are semantically related. You can use "Military operation" instead a noun phrase "Peacekeeping mission".