Spurs coach Gregg Popovich on Saturday praised Lt. Gen. Jay Silveria for his forceful denunciation of a racist incident that occurred last week at the U.S. Air Force Academy’s preparatory school. Silveria, superintendent of the academy, condemned racist notes written on the dormitory message boards of five African-American candidates at the prep school. “That kind of behavior has no place in the prep school, it has no place in the USAFA and it has no place in the United States Air Force,” Silveria said in front of 5,500 people, including all 4,000 cadets. “If you can’t treat someone with dignity and respect, get out.” Popovich, a 1970 graduate of Air Force who served five years of active duty, was asked for his reaction after the Silver & Black scrimmage at the AT&T Center.