Joe Mantegna and Gary Sinise host the annual tribute to America's military heroes. Slated performers include Danielle Bradbery, Megan Hilty, Jackie Evancho, Anthony Kearns and, under the baton of conductor Jack Everly, the National Symphony Orchestra. Gen. Colin Powell (USA Ret.) and Dianne Wiest are also expected to appear. This year, the event honors veterans of the Afghanistan War; and commemorates the 70th anniversary of World War II's D-Day. From the U.S. Capitol's West Lawn.