covering your back. six comes from being behind a person (six o' clock position). so "watch my six" is "cover me from behind"
SWAT Team Leader: Watch my six boys, this is goina get ugly
SWAT Team Members: Roger that sir.
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Military slang for "watch my back".
"Six" comes from six o' clock position.
Operator 1: "Dude, watch my six in there."
Operator 2: "Of course, man!"
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