U.S. Sen. Rob Portman is greeted by Col. John Knabel, 178th Wing Commander and Chief Master Sgt. Heidi Bunker, 178th Wing Command Chief Master Sgt. as he arrives at the 178th Wing, Springfield, Ohio for a tour of the wing's facilities Aug. 28. This five-day tour is part of Portman's national defense tour across Ohio where he is scheduled to visit each of Ohio's military installations.