Chapter 3, Part D of the Joint Travel Regulations (JTR) establishes the comprehensive policies and allowances for medical-related travel for Service members, civilian employees, and their dependents. It outlines the parameters for standard travel and transportation reimbursements across a variety of medical scenarios, including emergency travel due to incapacitating illness or injury, outpatient treatment, convalescent leave, transfers between medical facilities, periodic physical examinations for those on the Temporary Disability Retired List (TDRL), and access to non-covered Assisted Reproductive Technology (ART). The chapter provides specialized guidance for personnel stationed Outside the Continental United States (OCONUS), authorizing travel to the nearest capable medical or dental facility when adequate care is unavailable locally. Furthermore, it details the specific per diem and transportation allowances for medically necessary attendants and escorts accompanying patients who are physically incapable of traveling alone. Finally, the regulation governs the compassionate travel of up to three designated family members or a non-medical attendant to visit a seriously wounded, ill, or injured Service member or civilian employee, ensuring their transportation and limited per diem are covered to support the patient's health, welfare, and recovery