The opening day of the AT&T National golf tournament, held at Congressional Country Club in Bethesda, Md., had a military flare to it, as it usually does. But it went above and beyond standard fare. In addition to a Black Hawk flyover and a performance by the U.S. Air Force Honor Guard Drill Team, there was an appearance by a Medal of Honor recipient — not every PGA Tour event can claim that. Army Sgt. 1st Class Leroy Petry, who received the Medal of Honor last year, spoke during the opening ceremonies. Petry was participating in a house-clearing operation in…