WASHINGTON — Air Force veteran Brian Kolfage promised donors to his online crowdfunding campaign that their money would only go to construction of a wall on the U.S.-Mexico border. However, he cashed in on that trust by secretly taking more than $300,000 in donations to buy himself a luxury car, jewelry and pay down his debts, according to a Justice Department indictment unsealed Thursday. Kolfage 38, of Miramar Beach, Fla., is a well-known Purple Heart recipient who survived a rocket attack in 2004 at Balad Air Base in Iraq that caused the amputation of his legs and right arm, according...