Homepage - a very solid collection of OB information on the Luftwaffe.
The Imperial Japanese Navy - A page devoted
to the proud navy that lost the Pacific War.
The U-Boat Web - The source for information on U-boats during the
war. Also coverage of anti-submarine units, and operations.
France 1940 - Excellent collections of Orders of Battle and other
information concerning the French in 1940, and beyond.
The US Strategic Bombing Survey - The major source document of
Strategic Air War module.