Military members commonly describe direction using the hours of a clock. Whichever direction the vehicle, unit, or individual is moving is the 12 o’clock position, so the six o’clock position is to the rear. “Got your six” and the related “watch your six” come from service members telling each other that their rear is covered or that they need to watch out for an enemy attacking from behind.
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A Common US Military Phrase
“Got your six”
Meaning: Watching your back
Military members commonly describe direction using the hours of a clock. Whichever direction the vehicle, unit, or individual is moving is the 12 o’clock position, so the six o’clock position is to the rear. “Got your six” and the related “watch your six” come from service members telling each other that their rear is covered or that they need to watch out for an enemy attacking from behind.