The 14-year-old Defense Travel System has answered several questions that had beset service members and civilians who travel on Defense Department business, but others persist, according to a March 5 report to Congress by the Government Accountability Office. More DoD action is needed to resolve issues relating to missing documentation, setting metrics regarding how many travel vouchers should have been processed through the travel system, and determining how many people still travel under older legacy systems that predate DTS, the GAO stated. Also, costs of processing travel vouchers manually – common among legacy users – were nearly 15 times higher than using electronic vouchers, according to the report. Improvements, therefore, could save considerable money, the GAO stated.