What does 4 F mean in the military?
Sophia Terry
Updated on January 04, 2026
4-F – Registrant not qualified for military service. 4-FM – Medical specialist not qualified for military service. 4-G – Sole surviving son – son or brothers in a family where the parent or sibling died as a result of US military service, or is in a captured or M.I.A. status, are exempt from service in peacetime.
What does 4-F stand for in the military?
Definition of 4-F: classification as unfit for military service also : a person having this classification.