After the blast, an assessment crew consisting of the Central Intelligence Agency (CIA), Federal Bureau of Investigation (FBI), Diplomatic Security Service (DSS), and United States Air Force Office of Special Investigations (AFOSI) was sent to assess the risk to other security compounds in Saudi Arabia, and to offer suggestions for the Khobar Towers complex. It was suggested that Mylar tape be used to coat the windows for a barrier, but the cost, about US$4.5 million, was considered prohibitive. It was also suggested that the perimeter be expanded to at least 500 feet to protect servicemen from flying glass.