Tanner Mangum stood on the manicured grass inside LaVell Edwards Stadium looking up at the empty blue and white seats. He dreamed of playing here before cheering crowds all through his high school years, where he earned national honors and became BYU’s number-one recruited quarterback. But Mangum’s dream will have to wait. Instead of suiting up in his football pads, Mangum will wear a suit and tie for the next two years as a missionary for The Church of Jesus Christ of Latter-day Saints.