Немного покопался в англоязычном инете по данному вопросу.
ИМХО, в справочнике ошибка. Количество F-16 в USAF скорее всего должно быть в районе 2000.


The Lockheed Martin F-16 Fighting Falcon, the first of the US Air Force multi-role fighter aircraft, is the world's most prolific fighter with more than 2,000 in service with the USAF and 2,000 operational with 23 other countries. The F-16 and the F-15 Eagle were the world's first aircraft able to withstand higher G forces than the pilots. The Fighting Falcon entered service in 1979. The last of 2,231 F-16 fighters for the US Air Force was delivered in March 2005.
http://www.airforce-technology.com/projects/f16/