Of the 5,195 F-4s manufactured, some eight percent are still in service, plus a hundred converted to be unmanned targets for the U.S. Air Force. The F-4 is a 1950s design that, for its day, was quite advanced. The two seat, 28 ton F-4 is still a credible fighter bomber, able to carry eight tons of bombs and missiles. Normal combat radius is about 700 kilometers. The average sortie lasts about two hours.