32 CFR § 553.16 - Eligibility for memorialization in an Arlington National Cemetery memorial area.
(a) With the authority granted by 38 U.S.C. 2409, a memorial marker may be placed in an Arlington National Cemetery memorial area to honor the memory of service members or veterans, who are eligible for interment under § 553.12(a) and:
(1) Who are missing in action;
(2) Whose remains have not been recovered or identified;
(4) Whose remains were donated to science; or
(b) When the remains of a primarily eligible person are unavailable for one of the reasons listed in paragraph (a) of this section, and a derivatively eligible person who predeceased the primarily eligible person is already interred or inurned in Arlington National Cemetery, the primarily eligible person may be memorialized only on the existing headstone or on a replacement headstone, ordered with a new inscription. Consistent with the one-gravesite-per-family policy, a separate marker in a memorial area is not authorized.
(c) When a memorial marker for a primarily eligible person is already in place in a memorial area, and a derivatively eligible person is subsequently interred or inurned in Arlington National Cemetery, an inscription memorializing the primarily eligible person will be placed on the new headstone or niche cover. Consistent with the one-gravesite-per-family policy, the memorial marker will then be removed from the memorial area.