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Station Marines run through drills designed to teach them how to save the life of a drowning victim during a three-week Marine Combat Instructor of Water Survival course at the IronWorks Gym pool here Nov. 4. Marines are both physically and mentally tested through various written and physically demanding exams. - Station Marines run through drills designed to teach them how to save the life of a drowning victim during a three-week Marine Combat Instructor of Water Survival course at the IronWorks Gym pool here Nov. 4. Marines are both physically and mentally tested through various written and physically demanding exams.