FAMS = Federal Air Marshal Service

FAM = Federal Air Marshal

FAMs = Federal Air Marshals

ICE = Immigration and Customs Enforcement (the investigators of the Immigration/Customs branch)

CBP = Customs and Border Protection (Border Patrol and customs/immigration officers at ports of entry)

POE = Port of Entry (land or airport entry into the USA)

PC = Probable Cause (standard that must be met before a LEO can make an arrest)

Few more from the LEO side of the house......