As you have categorised this under "American Revolution" and "Famous People" I presume that BF might be Benjamin Franklin. This leads one then to assume that BR might be Benjamin Rush (who was also a signatory of the Declaration of Independence, and was also representing Pennsylvania).
But I cannot find anyone to fill out PR.
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PR civil option
diplomatic
Benjamin Franklin, Ethan Allen, and Benedict Arnold
British parliament
The diplomatic personnel recovery option involves government.