The Pennsylvania town of Greensburg has FACED MORE THAN ITS SHARE OF TRAGEDY. This week, the Iraqi Scud attack on a military barracks in Saudi Arabia left 13 members of a local Army Reserve unit dead. In 1988, three residents of the area were killed when Pan Am Flight 103 blew up over Lockerbie, Scotland. Three district soldiers died the following year when a gun turret exploded on the battleship Iowa. And in 1985, the crash in Newfoundland of a chartered plane bringing U.S. soldiers home claimed three others. Said Greensburg Mayor Dan Fajt: "You start to say to yourself, 'It's almost like we're doomed.' "