An abbreviation for "Friend or Foe" tags.
This is a tracking system used in the HALO video game universe.
The tags indicate if a unit is a friend, foe, unknown, or neutral. It also includes the name, rank, and service number.
Sergeant Johnson: "Marine, your FOF Tag says your a Corporal. Is that correct?"
Corporal Jones: "Yes, sir, Sergeant!"
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