inactive duty training
(23) The term “inactive duty training” means— (A) duty (other than full-time duty) prescribed for Reserves (including commissioned officers of the Reserve Corps 1 of the Public Health Service) by the Secretary concerned under section 206 of title 37 or any other provision of law; (B) special additional duties authorized for Reserves (including commissioned officers of the Reserve Corps of the Public Health Service) by an authority designated by the Secretary concerned and performed by them on a voluntary basis in connection with the prescribed training or maintenance activities of the units to which they are assigned; and (C) training (other than active duty for training) by a member of, or applicant for membership (as defined in section 8140(g) of title 5 ) in, the Senior Reserve Officers’ Training Corps prescribed under chapter 103 of title 10. In the case of a member of the Army National Guard or Air National Guard of any State, such term means duty (other than full-time duty) under sections 316, 502, 503, 504, or 505 of title 32, or the prior corresponding provisions of law. Such term does not include (i) work or study performed in connection with correspondence courses, (ii) attendance at an educational institution in an inactive status, or (iii) duty performed as a temporary member of the Coast Guard Reserve.
38 USC § 101(23)
None identified, default scope is assumed to be the parent (chapter 1) of this section.