Washington, Shawwal 3, 1432, Sep 1, 2011, SPA - Colombia's Defense Minister Rodrigo Rivera has resigned after only one year in office. Rodrigo Rivera will be replaced by Juan Carlos Pinzon, a top aide to President Juan Manuel Santos. Pinzon was a deputy defense minister under Santos in the previous administration. --SPA 12:06 LOCAL TIME 09:06 GMT www.spa.gov.sa/921701