United States Secret Service

The US Secret Service is a federal law enforcement agency specializing in protecting the President, his family, and other very important persons. The guard the President at all times and have saved him from many different assassination attempts. The Secret Service also operate internationally and cooperate with foreign agencies like INTERPOL.

Battle
See the Omnicube1's blog post: http://deadliestfiction.wikia.com/wiki/User_blog:Omnicube1/US_Secret_Service_vs._Russian_MVD_%28Reality_Matchup%29