CHATTANOOGA, TN - JULY 17: A sign is held up reading, 'God Bless America', as People attend an Interfaith Prayer Vigil at Olivet Baptist Church to honor the four Marines killed during a shooting on July 17, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station on July 16 in a strip mall and then drove to an operational support center operated by the U.S. Navy and killed four United States Marines. (Photo by Joe Raedle/Getty Images)
