Locating a Mercenary Convoy in Modern Warfare 3's new zombies mode is a bit of a trial. While completing story missions for the mode, you'll be tasked to find and wreck one of these motorcades as part of the Interceptor mission, but there's no real info about their location. Even though destroying a convoy counts as a little event in its own right, they won't appear on the map unless you get close.
If you're still coming to terms with zombies, our MWZ tips might help you overcome the Exclusion Zone. Otherwise, here's how to find a Mercenary Convoy in Modern Warfare 3 zombies for the mission, and get a Mercenary Stronghold Keycard while you're at it.
