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Cpl. Roy A. Covington III, a station air traffic controller, pretends to falls asleep as another Marine pretends to steal a red card while covering a Duty Non-Commissioned Officer post at Headquarters and Headquarters Squadron barracks 314 Sept. 16 in order to show the importance of Operational Security. DNCO post is a 24 hour responsibility given to NCOs in order for barracks to be secured and gaurded at all times. - Cpl. Roy A. Covington III, a station air traffic controller, pretends to falls asleep as another Marine pretends to steal a red card while covering a Duty Non-Commissioned Officer post at Headquarters and Headquarters Squadron barracks 314 Sept. 16 in order to show the importance of Operational Security. DNCO post is a 24 hour responsibility given to NCOs in order for barracks to be secured and gaurded at all times.