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From Wikipedia, the free encyclopedia. John P. Navin Jr. (born July 24, 1968) is an American film and television actor from Philadelphia. He is well known for his roles in the 1981 drama film Taps and the 1983 movie Losin' It, in both of which he co-starred with Tom Cruise. He also starred in National Lampoon's Vacation as Cousin Dale. Navin starred in the short-lived 1983 television series Jennifer Slept Here with Ann Jillian. He has made guest appearances on the television shows The Facts of Life, Gimme a Break!, Silver Spoons, Cheers, and Double Trouble. He has the honor for being the first patron on Cheers, appearing as a teenager who presents a fake I.D. to try to get a drink. Description above from the Wikipedia article John P. Navin Jr., licensed under CC-BY-SA, full list of contributors on Wikipedia.