It is DoD policy that cardholders use their DoD travel card for all their meals that are in support of their official travel. It is actually a policy violation to use other personal forms of payment for meals while on TDY.
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IAW DoD Mandate, all travelers (Military and Civilian) are required to have a GTC.
Don't charge office supplies, training, conference fees, photocopies, postal services, or equipment on the travel card. Use the purchase card or other acquisition procedures to procure non-travel services and products.
What is considered official travel? Any travel segment that is directly between the PDS/TDY, TDY/TDY, TDY/PDS, or PDS/PDS (for PCS travel) locations is considered official travel.