Which document is essential to initiate a travel request in DTS?

The Travel Authorization is the essential document required to initiate a travel request in the Defense Travel System (DTS). It serves as the formal approval for an individual's travel and outlines the specifics of the trip, including the destination, duration, and purpose of travel. This document not only authorizes the travel but also facilitates the reservation of transportation and lodging necessary for the trip.

Without a Travel Authorization, a traveler cannot proceed with submitting their travel request, as this step ensures that all planned travel adheres to the appropriate guidelines and receives the necessary approvals from command structures. Thus, the travel authorization is a vital first step in the DTS process, allowing for budget allocation, accountability, and compliance with travel policies.

The other document options serve various purposes; for instance, an Expense Report is used after travel is completed to account for expenses incurred, a Payment Receipt is proof of payment made for travel expenses, and a Travel Itinerary provides details about travel logistics but does not initiate the travel request itself.