Armored Mysterious Book Report No. 502 by John Dwaine McKenna   If you’re into reading about action-adventure, high-wire, death-defying and suicidal combat missions, Armored (Berkley, $28.00, 512 pages, 978-0-593-43687-5), by Mark Greaney, is the perfect novel to wind up your summer reading season with.  It features a nice guy named Josh Duffy, who’s in a desperate situation.  He’s a kick-ass military contractor who lost his left leg on his