Service members are at risk for unintentional drownings during training, occupational activities, and off-duty recreation. In the U.S., unintentional drowning ranks as the fifth leading cause of unintentional injury death and accounted for an average of 3,558 deaths (non-boating related) annually between 2007 and 2016. The current analysis extends and updates the findings of the June 2015 MSMR article by summarizing counts, rates, and correlates of risk of medical encounters related to accidental drownings among U.S. military members during 2013–2017.