Chin up, head down, and one round in the chamber, in case you stick the bayonet

What is Chin up, head down, and one round in the chamber, in case you stick the bayonet?

Chin up, head down, and one round in the chamber, in case you stick the bayonet meaning in Military terminology / glossary / dictionary is:
A catchy Marine saying, used by Wise and Knowing Sergeants. Means to be prepared, alert, and ready for the unexpected.

 

reference: Updated Glossary of Military Speak and Catchy Sayings

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