Overseas TDY travel involves additional requirements and considerations beyond domestic trips. From passport requirements to foreign per diem rates, OCONUS travel demands more preparation and attention to detail.
Passport and Visa Requirements
Official travel typically requires an official passport rather than a personal tourist passport. Obtaining or renewing official passports takes time, so initiating the process early prevents last-minute scrambles. Some countries require visas even for official travel.
Certain Status of Forces Agreements allow entry with orders and military ID alone. Understanding which countries require which documents prevents border complications. Your organization’s travel office should provide country-specific guidance.
Foreign Per Diem Rates
Overseas per diem rates are published in the Defense Travel Management Office Civilian Personnel Per Diem Bulletin and reflect actual costs in foreign locations. Currency fluctuations can make published rates feel generous or tight depending on timing.

Some overseas locations have separate rates for different cities within the same country. Ensuring your authorization reflects actual TDY locations rather than country capitals prevents per diem discrepancies.
Medical Preparation
Immunizations and medical clearances may be required for certain destinations. The Travel Medicine clinic can identify requirements and provide necessary vaccinations. Starting this process early ensures full protection before departure.
Bringing adequate supplies of any regular medications prevents problems with overseas pharmacies. Carrying prescriptions in original containers with documentation helps at customs. Understanding what medical support exists at your destination informs preparation.
Communications and Connectivity
International phone plans or local SIM cards prevent massive roaming charges. Understanding what communication options exist at your destination helps set expectations. Some locations have excellent connectivity while others present significant challenges.
Secure communication requirements may complicate standard solutions. Coordinating with your security office ensures you maintain required protections while remaining reachable.
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