Transportation Allowances and Mileage - S-1 Procedural Page

Role and responsibility

The Marine traveler selects the authorized mode of travel per DoDFMR Vol 9DODFMR Vol 9 Chapter 4 and the JTRJTR. The IPAC pay clerk validates transportation allowance entitlements per Chapter 4. The S-1 chief audits transportation expenses against the JTR rate framework. The Authorizing Official (AO) inside DTS approves the authorization with the appropriate transportation mode per MCO 4650.39AMCO 4650.39A. The Commercial Travel Office (CTO) issues tickets after AO approval per DoD 4500.9-R.

Source documents flow from the travel orders, the JTR Chapter 2 transportation allowance framework, the DTMO mileage rate tables, the Commercial Travel Office (CTO) ticketing per DoD 4500.9-R, the receipts for transportation expenses, the Constructed Travel Worksheet (CTW) when applicable, and the prior travel record. Outputs include the documented mode of travel, the applied mileage rate, the CTO ticketing record, the local transportation expense documentation, the CTW when required for non-economy class or alternate routing, the audit trail, and the travel claim per Vol 9 Chapter 8.

Per DoDFMR Vol 9 Chapter 4, transportation allowances cover the modes of travel, mileage rates, and authorized routing for official travel. Per the JTR, the operational rates update on the DTMO published cycle. Per DoD 4500.9-R, the Defense Transportation Regulation covers the broader transportation framework.

Trigger events

• Marine travel triggers transportation mode selection.
• POV (privately owned vehicle) mileage claim.
• Air travel ticketing through CTO.
• Local transportation expense (taxi, rental car, public transit).
• Premium class travel request.
• Annual mileage rate update from DTMO.
• Constructed travel scenario.

Processing workflow

1. Identify the authorized mode of travel. Per DoDFMR Vol 9DODFMR Vol 9 Chapter 4 and the JTRJTR, the mode flows from the cost-effective option per the trip parameters.
2. Apply mileage rates. Per the JTR Chapter 2 and DTMO mileage rate tables, the POV mileage rate, in-and-around mileage rate, and rental car mileage apply per the situation.
3. Validate authorized routing. Per Chapter 4, the authorized route is the most direct usually-traveled route between the origin and destination.
4. Apply constructed travel rule. Per Chapter 4 and the JTR, when a Marine travels by an alternate mode or route (e.g., POV instead of air), the constructed travel reimbursement caps at what the authorized mode would have cost.
5. Process CTO ticketing. Per DoD 4500.9-R and MCO 4650.39A, the CTO issues commercial tickets after AO approval.
6. Apply local transportation expense reimbursement. Per the JTR, local transportation expenses (taxi, public transit, rental car, parking) reimburse per the per diem and trip-specific rules.
7. Validate transportation expenses against the JTR. The IPAC pay clerk and disbursing technician validate.
8. Coordinate Government Transportation Request (GTR) when applicable. Per Chapter 4 and DoD 4500.9-R, GTR routing applies in specific operational cases.
9. Cut the travel claim with transportation expense documentation. Per Vol 9 Chapter 8, the voucher includes transportation expense detail with receipts.
10. Audit transportation entitlements. The S-1 chief audits monthly against the JTR framework.

Systems of record and forms

Systems

• Defense Travel System (DTS). Per MCO 4650.39A.
• Commercial Travel Office (CTO). Per DoD 4500.9-R.
• DTMO Mileage Rate Tables. Per JTR.
• DFAS Pay Processing. Per Vol 9 Chapter 8.

Forms

• Constructed Travel Worksheet (CTW). Per Vol 9 Chapter 4 and the JTR.
• CTO Ticketing Receipt. Per DoD 4500.9-R.
• Transportation Expense Receipts. Per Vol 9 Chapter 4.
• Government Transportation Request (GTR). Per DoD 4500.9-R.

Common pitfalls

• POV mileage rate misapplied. Per DTMO and the JTRJTR, the rate updates periodically.
• Premium class without CTW. Per DoDFMR Vol 9DODFMR Vol 9 Chapter 4 and the JTR, premium class requires CTW.
• Local transportation expense reimbursement past JTR cap. The JTR sets per diem and local transportation caps.
• Rental car expense without authorization. Per Chapter 4 and the JTR, rental car authorization flows from the AO.
• Constructed travel calculation wrong. Per Chapter 4, the constructed travel cost caps reimbursement.
• CTO ticketing not coordinated through DTS. Per MCO 4650.39A, the CTO interfaces with DTS for ticketing.

Decision points

• Mode of travel. Per Vol 9 Chapter 4 and the JTR, the cost-effective mode applies.
• Authorized routing. Per Chapter 4, the most direct usually-traveled route applies.
• Constructed travel scenario. Per Chapter 4, the constructed travel rule caps reimbursement at the authorized mode cost.
• Premium class justification. Per the JTR, premium class requires CTW supporting documentation.

Authority

This sub-page sits under DoDFMR Vol 9DODFMR Vol 9 Chapter 4 (Transportation Allowances). The JTRJTR Chapter 2 implements transportation entitlements at the traveler level. DoD 4500.9-R covers Defense Transportation Regulation. MCO 4650.39AMCO 4650.39A covers DTS at the Marine Corps level. DTMO publishes mileage rate tables.

Related references

• DoDFMR Vol 9 Chapter 4. Transportation allowances.
• JTR Chapter 2. Traveler-level transportation entitlements.
• DoD 4500.9-R. Defense Transportation Regulation.
• MCO 4650.39A. DTS.
• DTMO published rates.