https://www.astrotx.com/M-16A1%20Rifle.pdf
Keep your own rifle clean and lubed properly.
Make sure your teammates’ rifles are kept that way, as well.
This is not a drill.
Supplemental from the modern era; recommended:
Bracken Sends
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Western Rifle Shooters Association
World War 3 has already started and you will be impacted. The only open questions are when, by whom, and to what extent. Tempus fugit.