Honking Twice
In the military, the standard practice is to honk twice so that others are warned that you’re backing up. When they go back to civilian life, ex-soldiers still do this by force of habit.

Honking Twice
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In the military, the standard practice is to honk twice so that others are warned that you’re backing up. When they go back to civilian life, ex-soldiers still do this by force of habit.

Honking Twice