"We get new missionaries every six weeks," said Baton Rouge Mission President Jim Wall, "and every six weeks, we have missionaries go home. And the contrast is incredible."
The Church of Jesus Christ of Latter-day Saints is one of the fastest growing religion in the U.S., and more than 55,000 missionaries serve throughout the world. For the most part, they are young men about 20 years old. For "Nightline," the LDS church gave ABC News' Bob Woodruff rare behind-the-scenes access to missionaries in Louisiana over a two-day stretch that included door-to-door proselytizing, work on service projects and teaching.