Sec. 501. Payments for unused accrued leave. 502. Absences due to sickness, wounds, and certain other causes. 503. Absence without leave or over leave. 504. Cadets and midshipmen: chapter does not apply to. AMENDMENTS 1990 - Pub. L. 101-510, div. A, title XIV, Sec. 1484(f)(1), Nov. 5, 1990, 104 Stat. 1717, revised chapter heading so as to appear in all capital letters.