I see a date reference to 1984 (the first definition), and I entered service in 1980: never encountered any rubber ducks!
Funny though, I enlisted under Carter and as a machine gunner the weapons training was memorizing the characterisitics (still remember: "air-cooled, belt-fed, gas-operated" for the M60). Then Reagan came in and it was either live or it was nothing, mostly live: all the way!
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