U.S. Marines with 2nd Combat Readiness Regiment, 2nd Marine Logistics Group, practice in-water treading during a water survival advanced course at Marine Corps Base Camp Lejeune, North Carolina, Nov.

A 17-year-old kayaker spent nearly 12 hours treading water and clinging to his kayak Wednesday after becoming separated from his high school paddling group, the U.S. Coast Guard said. The U.S. Coast ...