Tom Clancy try:

• Desmond Bagley
• Edward L. Beach
• Jon Cleary
• Stephen Coonts
• Clive Cussler
• Len Deighton
• Sean Flannery
• W.E.B. Griffin
• David Hagberg
• Payne Harrison
• Richard Herman
• Jack Higgins
• Richard Hough
• David Ignatius
• Robert Ludlum
• Alistair MacLean
• John Masters
• Nicholas Monsarrat
• David Morrell
• David Poyer
• Douglas Reeman
• Martin Cruz Smith
• Steve Sohmer
• Craig Thomas
• Ross Thomas
• Joe Weber
• David Westheimer
• Herman Wouk

Some of Tom Clancy's favorite war novels
(from The Book of Lists):

Run Silent, Run Deep by Captain Edward L. Beach
F BEAC
A submarine patrol in the Pacific during WWII.

The Third World War, August 1985 by General Sir John Hackett
355.48 HA
Politically and technically detailed account of a future war between NATO and Warsaw Pact powers.

HMS Ulysses by Alistair MacLean
F MACL
British cruiser in Arctic waters during WWII.

The Cruel Sea by Nicholas Monsarrat
F MONS
Two British ships in the North Atlantic during WWII.

The Caine Mutiny by Herman Wouk
F WOUK
Officers on a U. S. Navy ship during WWII mutiny against their neurotic captain and are then court-martialed.