F is just their classification which I believe is just “Fighter” meaning they are either air superiority aircraft or some variety of multi-role that can do both air to air and air to ground missions.
Back before and during WW2 instead of F they used P which I believe stood for “Pursuit” which is why we have the P-47, P-38, P-51, etc. and then B for “Bomber” which we still use today.
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