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In accordance with the Hawaii Range Complex (HRC) Monitoring Plan, data were collected during 17-18 February 2015 during a Submarine Commanders Course (SCC) training event. The goals of the monitoring and this study were to: (1) collect data to assess the effectiveness of the Navy Lookout team; and (2) obtain data to characterize the possible exposure of marine species to mid-frequency active sonar (MFAS). This event is the twelfth aboard a U.S. Navy guided missle destroyer (DDG) in which data were collected to determine effectiveness; data will be combined with future monitoring efforts in order to determine the effectiveness of Navy lookouts as a whole, rather than specific to each vessel.