Pokémon Go has invaded America. Since launching on July 6, the free augmented reality game has prompted millions of users to explore places they ordinarily wouldn't. That includes US military installations.

On July 11, the Public Affairs Office at Joint Base Lewis-McChord in Washington state put out an announcement calling for users to be safe and courteous while using the app on military bases.

"Since Pokémon Go hit last week there have been reports of serious injuries and accidents of people driving or walking while looking at the app and chasing after the virtual Pokémon," the announcement stated. "For budding Pokemon Trainers using Pokemon Go on JBLM … DO NOT chase Pokémon into controlled or restricted areas, office buildings, or homes on base."

Troops and civilians on military bases overseas are using the app to search for Pokémon worldwide. Stars and Stripes reported that during a server test in Japan someone caught a Charmander in the lobby of the 374th Medical Group hospital and a Squirtle in Stars and Stripes' Yokota office.

The same day, the US Marine Corps' official Twitter account put out a photo of Pokémon on a firing range with the caption: "Get off the firing line, Pikachu! That's a safety violation!"