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The Proficient Service Medallion was a prestigious award given out to exemplary Cardassian officers serving the Union.
In 2357, Gul Darhe'el received the Proficient Service Medallion. The ceremony occurred on Cardassia at the same time a serious accident at the Gallitep labor camp occurred. (DS9 episode: "Duet", ST - Terok Nor novel: Night of the Wolves)