guard u.s. military personnel at a recruiting station. in texas, air force sergeant jose cortex worries recruiters are sitting ducks. >> we are essentially a lone target. >> reporter: at the chattanooga recruiting center several marine tour combat veterans reports as bullets flew they went into combat mode to clear the area. having everyone drop to the floor and escape out the back. an initial pentagon review in the hours after the attack led to no significant security changes. pentagon officials say. but the defense department is under pressure from the white house to show action on beefing up troop protection. >> the president believes it's appropriate for the department of defense to conduct a review. >> reporter: ash carter is asking commanders to take another look. several republican presidential