Same word as flagmen:
caretaker, curator,custodian,detective, flagman,guard,keeper, lookout,observer, patrol, patrolman, picket, policeman, ranger,scout, security guard, security man,sentinel, sentry, signalman, spotter,spy,ward, warden,watch, watcher
caretaker, curator,custodian,detective, flagman,guard,keeper, lookout,observer, patrol, patrolman, picket, policeman, ranger,scout, security guard, security man,sentinel, sentry, signalman, spotter,spy,ward, warden,watch, watcher