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You've probably seen the meme of the bored-looking lifeguard sitting next to a pool. It says, "If you ever feel useless just remember that someone is a lifeguard at the Olympics swimming event." Funny stuff, but hardly a joking matter. Lifeguards are stationed around the pool at every major swimming competition. That includes this week's U.S. national championships in Indianapolis, which feature Olympic champions such as Katie Ledecky and Caeleb Dressel. Everyone competing at the IU Natatorium is sure glad to have 'em. They point out that anything can happen, even to the world's best swimmers.