Соответствующая норма
United States of America
Practice Relating to Rule 138. The Elderly, Disabled and Infirm
Section A. The elderly
The US Field Manual (1956) provides: “The Parties to the conflict shall endeavour to conclude local agreements for the removal from besieged or encircled areas of … aged persons”. 
United States, Field Manual 27-10, The Law of Land Warfare, US Department of the Army, 18 July 1956, as modified by Change No. 1, 15 July 1976, § 256; see also § 44.
The US Air Force Pamphlet (1976) provides: “Removal of … aged persons … from besieged or encircled areas is encouraged.” 
United States, Air Force Pamphlet 110-31, International Law – The Conduct of Armed Conflict and Air Operations, US Department of the Air Force, 1976, § 14-3.