Related Rule
United States of America
Practice Relating to Rule 68. Precautions while Receiving Parlementaires
Section A. General
The US Field Manual (1956) provides: “The commander to whom a parlementaire is sent … may take all the necessary steps to prevent the parlementaire taking advantage of his mission to obtain information.” 
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, § 463.