The Guardian (2006)

The plot follows Senior Chief Petty Officer Ben Randall (Kevin Costner) and Jake Fischer (Ashton Kutcher) at the United States Coast Guard's Aviation Survival Technician (AST) Program. Ben Randall is the top rescue swimmer who continues to work against regulation past the age of 40. Jake Fischer is a hot-shot candidate for AST who was ranked as a top competitive swimmer in high school. The movie title is introduced by a mythic tale: People lost at sea often claim they feel a presence lifting them to the surface, breathing life into their bodies while they are waiting for help to arrive. They call this presence "The Guardian."