 More on CBS's David Martin from our Christopher Cruz. Martin has been reporting on national security matters and the Defense Department for 40 years. Now, a month shy of his 81st birthday, he's stepping away from day-to-day coverage to focus on long-form stories. A Navy veteran, Martin has covered 15 defense secretaries during his career, including the current one, Lloyd Austin, who spoke at a ceremony at the Pentagon today honoring Martin. David is old school.