Assistant secretary of state for diplomatic security announces decision to resign . The resignation comes after a report that he had been involved in an extramarital affair with his biographer, Paula Broadwell. Blackwater issues appeal to supporters to stand up for company . Blackwater is the most prominent of the military contractors working in Iraq , where an estimated 25,000 private contractors guard diplomats , reconstruction workers and government officials . NEW : Blackwater shooting survivor says U.S. Embassy offered victims money .
Assistant secretary of state for diplomatic security announces decision to resign . The resignation comes after a report that he had been involved in an extramarital affair with his biographer, Paula Broadwell. Blackwater issues appeal to supporters to stand up for company . NEW : Blackwater shooting survivor says U.S. Embassy offered victims money .