Standards/Regulatory
Aerial Systems Advisory Group
NATO Air Refueling Handbook
(Note: Limited to to DoD employees and to those on the Defense Logistics services Center list of certified DoD contractors. Submit a Form DD 2345 to DLSC to become a certified DoD contractor)
Aircraft Designation Systems
http://www.hazegray.org/faq/designat.htm
http://www.driko.org/des.html
http://www.personal.psu.edu/users/d/o/dob104/aviation/us/
http://www.designation-systems.net/index.html
US Military Aviation Designation Systems
Designations U.S. Military Aircraft 1911-2002
Designations U.S. Military Aircraft and Weapon