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The Defense Travel System (DTS) is a software application for the US Department of Defense that allows employees to manage their business travel.
DTS allows employees to create authorizations (TDY travel orders), prepare travel reservations, receive approvals, generate travel vouchers, and receive a split reimbursement between their bank accounts and the Government Travel Charge Card (GTCC) vendor.
DTS operates at over 9,500 total sites worldwide, and on average, DTS processes more than 25,000 transactions while approximately 100,000 unique users access it on a daily basis. Defense Manpower Data Center (DMDC) Program Management Office DTS (PMO-DTS) has the program oversight (acquisition, technical, operation and maintenance) oversight of DTS while the Defense Travel Management Office (DTMO) has functional oversight.
Travel Assistance Center (TAC)
The TAC provides travel assistance to the Defense travel community before, during, and after official travel. The staff provides advice and assistance on the DTS, DoD travel card, travel policy, commercial travel services and programs, and allowances and entitlements.
Travel Explorer (TraX) allows users to submit a call center ticket, track the progress of open tickets.
The Defense Travel Management Office (DTMO) provides training resources for using DTS:
- Web-based Training
- Distance Learning
- Enterprise Web-based Training System (EWTS) 
- Reference Materials