This regulation applies to Active Army soldiers, U. S. Military Academy cadets, and the following categories of the Army National Guard of the United States (ARNGUS) and the U.S. Army Reserve (USAR) unless otherwise indicated:

a. USAR soldiers on active duty for 90 or more continuous days.

b. ARNGUS soldiers on active duty or full-time National Guard duty for 90 or more continuous days.

c. ARNGUS and USAR soldier mobilized under title 10, U.S. Code, sections 12301(a), 12302, or 12304.

d. ARNG soldiers called into Federal service under title 10, U.S. Code, chapter 15, or section 12406, regardless of the length of mobilization.