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  • Hallion in 2010. Thomas Francis "Tom" Hallion (born September 5, 1956) is an American umpire in Major League Baseball who has worked in the National League from 1985 to 1999 and throughout both major leagues since 2005. He is currently a crew chief. — “Tom Hallion - Wikipedia, the free encyclopedia”,
  • Dr. Richard P. Hallion is Senior Adviser for Air and Space Issues, Directorate for Security, Counterintelligence and Special Programs Oversight, the Pentagon, Washington, D.C. Dr. Hallion graduated from the University of Maryland in 1970. — “Richard P. Hallion - Wikipedia, the free encyclopedia”,
  • The Bell X-5 was the first aircraft capable of changing the sweep of its wings in flight. Hallion, Richard P. On The Frontier: Flight Research At Dryden 1946-1981 (NASA SP4303). — “Bell X-5 - Wikipedia, the free encyclopedia”,


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