cemetery says officials think the headstones were placed there to prevent erosion. the pentagon recently removed arlington top two officials after complaint of poor management. authorities are looking for several members of the afghan military who have gone awol from american base in texas. national correspondent catherine herridge is here to tell us about a security breach that hasn t really received a lot of attention yet. reporter: good evening. given military officers are unaccounted for today, john cornyn sent letter of complaint to the secretary of airport. and i request an immediate report on how such a serious violation of security was allowed to happen not once but on 17 separate occasions. the assessment of the threat to the individuals of texas and the citizens. detailed overview of your plan of action to correct securities failure. according to the document sent twice in ten days to