The slug is the unit of mass in the US common system of units, where the pound is the unit of force. The pound is therefore the unit of weight since weight is defined as the force of gravity on an object. While the pound force and pound weight are the widely used units for commerce in the United States, their use is strongly discouraged in scientific work. The standard units for most of scientific work are the SI units.
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A slug is a mollusk like a snail, if you mean a slug like from a shotgun about length of shell, slug can also be slang for bullets which can be literally any size up to max.
Aviation Jet Mechanic 2nd Class.
AN is the rank designation for an Airman (E-3 in the Naval Aviation community).
Radio and Weapons Operator, a term coined in Vietnam, I believe for the 'back seater' in the mighty Phantom.
Portuguese Naval Aviation was created in 1917.