Answer: fallin

AnswerCrossword Clue
FALLINDrill sergeant's order
FALLINParade command
FALLINBoot-camp command
FALLINDrill sergeant's command
FALLINCollapse
FALLINArmy command.
FALLINCorporal's command.
FALLINN.C.O.'s order
FALLINSergeant's order
FALLIN.... with: become acquainted
FALLINCommand!