Dr. Stewart, Reporting for Duty The U.S. Army is struggling for every recruit it can find, but it does have one new doctor. Robert Stewart, a Cleveland heart transplant surgeon, has joined the Army at age 56. He says he's wanted to help his country since the Sept. 11 attacks. He showed up to his Army physical, where the other recruits averaged 18 1/2. Also: The U.S. Marines have begun drafting dogs. The canines are being trained to sniff out explosives in Afghanistan and Iraq.