AirVectors - Great information and history source on military aircraft

[Knock-Knock]

Scroll down a little and choose your era (or maker) of interest, and go from there:

 

http://www.airvectors.net/idx_wmil.html

[Lusik]

Nice find. I didn't know the site.

[msalama]

An oldie but goodie. That site has existed for as long as I can remember - and I started to use the Internet in 1991 ;) Still, a great site for all aircraft aficionados!