However, a lot of people in the media are using this phrase, and it should worry you. "Show Of Force" is the phrase you use when you send a fleet around the world to remind potential enemies that you have a fleet, and they should behave. It goes with "big stick" diplomacy.
It should worry you that Mexico is deploying a "show of force" in American cities, and it should also worry you that the American media doesn't think anything of it.
Update: a reader reports that before the May 1 protests, he saw President Fox in the media, addressing
It was encouragement from the homelands leader. It seemed like something a commander would put out to an invading force.