Chapter 3, Part A of the Joint Travel Regulations (JTR), titled "TDY Travel - Business Travel," establishes the comprehensive policies and allowances for routine Temporary Duty (TDY) and other official business travel. The chapter defines eligibility and computational rules for common business activities, such as inspections, technical assistance, and conference attendance, emphasizing that travelers generally receive the standard transportation and per diem allowances found in Chapter 2,. It provides specialized guidance for Reserve Component (RC) members performing active duty with or without pay (including those who commute daily), retired Service members recalled to active duty, and individuals traveling under Invitational Travel Authorizations (ITAs),. Furthermore, Part A dictates the allowances for specific travel scenarios ...