Which type of government authorization must travelers receive before using DTS?

Travelers must receive Travel Orders before using the Defense Travel System (DTS). Travel Orders serve as the official documentation that outlines the purpose of travel, the destination, duration, and other relevant details necessary for processing travel arrangements and funding. These orders are crucial because they ensure that all travel is in accordance with government policies and is properly authorized at the appropriate level.

Properly issued Travel Orders also help prevent unauthorized travel and safeguard fiscal responsibility, as they establish the accountability of resources used during the travel. This formal authorization aligns with the structured processes and governance within military and civilian travel systems. Other options, while may seem relevant, do not provide the same level of official approval or detail necessary for executing travel.