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"this is not a drill message" -- implying the following messages are not simulation or exercise related message but of vital and usually life/death importance
"Charlie one five, Zulu four zero, no duff message, Zimmerman is down, Zimmerman is down"

"Zulu four zero, charlie one five, medic on the way"
by Shizuma April 15, 2008

Words related to no duff

drill emergency help military procedure radio