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I know it from the critically acclaimed film, Full Metal Jacket, and a few pop culture references since, but apparently it comes from the Marine Corps training guidebook.

The head size to body ratio is that of a house cat.

Mountain lions have "little" heads and long-ish necks relative to their body size.

Adapted from, and with apolologies to, The Rifleman's Creed:

This is my backpack. There are many like it, but this one is mine. My backpack is my best friend. It is my life. I must master it as I...