AdvertisementGunman's Motivation Unclear After Shootings At Tennessee Military SitesJuly 16, 2015Krishnadev CalamurEyder PeraltafacebookEmailReserve Recruitment personnel stand outside a military recruiting center on Lee Highway in Chattanooga, Tenn., as the area is cordoned off with blue shell casing markers. Officials said two military facilities in Tennessee were attacked in shootings Thursday. (Chattanooga Times Free Press via AP)