Web sites for military motorcycles in Canada and the USA

Would anyone be able to point me to Canadian and American web sites on military motorcycles. I'm interested in learning about Allied (especially U.S. and Canadian military) prewar and WW2 military motorcycles. I am particularly interested in sites about restoring these bikes. Thanks.

I own a 1943 BSA M20WD despatch rider's bike. Not exactly what you are looking for, but this site has good info on that particular model:

http://wdbsa.nl/