GI letter letters

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Now we are looking on the crossword clue: GI letter letters.
it’s A 17 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: APO.

Random information on the term “APO”:

Acting pilot officer (APO) is the lowest commissioned grade in the Royal Air Force, being immediately junior to pilot officer. Unlike other RAF ranks which officers may hold in an acting capacity, acting pilot officer is maintained as a separate grade. It normally denotes an officer who has recently been commissioned and joined as a non-graduate direct entrant. Acting pilot officer is not an actual rank, and APOs are later regraded to pilot officer, not promoted.
Taken from Wikipedia