Although the site is dedicated mostly to Airliners, there are still a lot of military aircraft there as well from WWII to present day. Go to the search page and you can search the pictures by manufacturer as well as by airframe. Some incredible images there.
I did a search for Canadair CL415 which is a waterbomber and was astounded when the site returned a total of 305 very high quality images showing all aspects of the aircraft.
I hope the site will be of some use to you guys!!!
RODC