Crossword clues for Military branch: Abbr. 4 lettersAnswerClueARTYMilitary branch: Abbr.USAFFlying military branch: Abbr.USAFAmerican military branch: Abbr.USAFBranch of the military (abbr.)CAVMilitary branch: Abbr.USNMilitary branch: Abbr.AFSMilitary branches: Abbr.