Like Jim (Chester7777), I also like Tom Clancy's writings. Other of my favorite authors are Frederick Forsyth, Wilbur Smith, Michael Connelly, Stephen Hunter, Elliot Arnold, Dee Brown, Edgar Rice Burrows, Winston Churchill, Michael Crichton, P.T. Deutermann, Vince Flynn, J. Frank Dobie, Arthur Conan Doyle, Allan Eckert, Ian Fleming, C.S. Forester, Thomas Harris, Jack Higgins, James Jones, Jonathan Kellerman, Elmer Kelton, William Manchester, David McCullough (a historian who's written some excellent biographies), Kenneth Roberts and a host of lesser-known writers.
Some of my favorite subjects are history (both American and British) and biographies. I love to read about the old West and military history.