As you can see from the map above, Hideo Kojima's plan to launch a secret army in Japan is working quite well. A new service uses Google Maps to show you the points of interest you'll want to hit in order to recruit new characters via Metal Gear Solid: Portable Ops' unique and innovative GPS mode. Although an English language version of this service is supposedly "coming soon," I wouldn't be surprised if it never saw the light of day: certainly, it would be a far more demanding undertaking to travel across the entirity of America in order to unlock as many characters as possible.
Of course, the true Metal Gear fans have already started their cross-country trek.