United States of America
Practice Relating to Rule 55. Access for Humanitarian Relief to Civilians in Need
Section C. Access for humanitarian relief via third States
The US Field Manual (1956) provides:
If the whole or part of the population of an occupied territory is inadequately supplied, the Occupying Power shall agree to relief schemes on behalf of the said population, and shall facilitate them by all the means at its disposal.
Such schemes, which may be undertaken … by States shall consist, in particular, of the provision of consignments of foodstuffs, medical supplies and clothing.
All Contracting Parties shall permit the free passage of these consignments and shall guarantee their protection.