Originally Posted by Bevo
I'm not sure where SAC is getting their data
http://www.alternatewars.com/SAC/MIL..._SAC_Specs.pdf
MIIITARY SPECIFICATION CHARTS;
STANDARD AIRCRAFT CHARACTERISTICS AND PERFORMANCE,
PILOTED AIRCRAFT
This specification was approved by the Departments of the Army, the Navy, and the Air Force for use of procurement services of the respective Departments.
SAC = STANDARD AIRCRAFT CHARACTERISTICS
Simply put, the SAC is the official US government statement of the flight characteristics of the aircraft, and is an official document of the respective services.
The SAC documents I linked above carry the following ID numbers:
F-8E SAC: NAVAIR 00-110AF8-5
F-14A SAC: NAVAIR 00-110AF14-2
F-14D SAC: NAVAIR 00-110AF14-2
All bear the comment "PUBLISHED BY DIRECTION OF THE COMMANDER OF THE NAVAL AIR SYSTEMS COMMAND"
F-15C SAC: AFG 2, Vol 1, Addn 61
And carries the comment "BY AUTHORITY OF THE SECRETARY OF THE AIR FORCE"