Chapter 3, Part E of the Joint Travel Regulations (JTR), titled “Leave in Conjunction with TDY,” establishes the rules and financial limitations for combining personal leave with official Temporary Duty (TDY) travel. The regulation permits travelers to combine leave with official travel provided it incurs no additional cost to the Government, with reimbursement strictly capped at the constructed cost of the official travel had no personal leave occurred. It outlines specific allowances for complex scenarios, such as receiving TDY orders while already on leave, interrupting leave for official duties, or being recalled from leave due to operational emergencies. The chapter dictates the effect of leave on per diem, stipulating that Service members receive no per diem for days in a leave status, while detailing speci ...