If you like W.E.B. Griffin, Tom Clancy or Clive Cussler, you may also like these authors.

Patrick Robinson

Larry Bond

Stephen Coonts

P.T. Deutermann

Brian Haig

Patrick Davis

If you like military science fiction/fantasy, try these authors.

David Weber

The Honor Harrington series

Lois McMaster Bujold

The Miles Vorkosigan series

John Ringo