The term 4F or 4-F, was commonly used in the United States to refer to someone with a Selective Service classification of "4F", meaning that they are ineligible for conscription (forced induction into military service or the draft) due to a disability or physical incapacity to serve in the military. SSS redirects to here, you may also want the Social Security System The Selective Service System, in the United States, is a system to register all males over the age of 18 for the purpose of having information available about potential soldiers in case of war. ... The United States has employed conscription (mandatory military service, also called the draft) several times, usually during war but also during the nominal peace of the Cold War. ...
Note that this usage refers exclusively to someone male, since women have always been ineligible for conscription.
With the elimination of conscription in the U.S. the term has mostly fallen out of use.
The A-4F was the last attack Skyhawk version to be built for the Navy.
The A-4F was based on the earlier A-4E, but differed in incorporating the nosewheel steering, upper wing lift spoilers, the Escapac 1C-3 ejector and the 9300 lb.s.t.
During service, the A-4F was retrofitted with a humpbacked avionics compartment located on top of the fuselage immediately behind the cockpit.
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