Related Rule
Philippines
Practice Relating to Rule 67. Inviolability of Parlementaires
The Soldier’s Rules (1989) of the Philippines includes the following order: “Respect all persons and objects bearing … the white flag of truce.” 
Philippines, Soldier’s Rules, in Handbook on Discipline, Annex C(I), General Headquarters, Armed Forces of the Philippines, Camp General Emilio Aguinaldo, Quezon City, 1989, § 10.
The Joint Circular on Adherence to IHL and Human Rights (1991) of the Philippines provides: “Members of the AFP [Armed Forces of the Philippines] and PNP [Philippine National Police] shall respect all persons and objects bearing … the White Flag of Truce.” 
Philippines, Implementation Guidelines for Presidential Memorandum Order No. 393, dated 9 September 1991, Directing the Armed Forces of the Philippines and the Philippines National Police to Reaffirm their Adherence to the Principles of Humanitarian Law and Human Rights in the Conduct of Security/Police Operations, Joint Circular Number 2-91, Department of National Defense, Department of Interior and Local Government, 1991, § 2a(5).
According to the Report on the Practice of the Philippines, government forces are instructed to respect the white flag of truce at all times. 
Report on the Practice of the Philippines, 1997, Chapter 2.2.