Related Rule
Practice Relating to Rule 16. Target Verification
The Joint Circular on Adherence to IHL and Human Rights (1991) of the Philippines states: “Preparation fires may be delivered only against confirmed hostile positions prior to an attack or offensive action subject to the approval/direction of the brigade/equivalent level commander.” 
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, § 2(c)(3).
The Philippines’ AFP Standing Rules of Engagement (2005) states:
8. General Rules for the Correct Use of Force towards Mission Accomplishment
f. Positive Identification (PID) of targets is required prior to engagement. PID is a reasonable certainty that the object of attack is verified and confirmed as a legitimate military target in accordance with this SROE [Standing Rules of Engagement]. 
Philippines, AFP Standing Rules of Engagement, Armed Forces of the Philippines, General Headquarters, Office of the Chief of Staff, 1 December 2005, § 8(f).
The Philippine Army Soldier’s Handbook on Human Rights and International Humanitarian Law (2006) provides:
During an engagement:
6. Double-check your target. Don’t be too hasty and careless in firing at anyone whom you think is a combatant. There are times when it is too late to know that the supposed combatant is just carrying an airgun or a farm tool. Sometimes, friendly troops also become victims of friendly fires. This is also true to field artillery units. 
Philippines, Philippine Army Soldier’s Handbook on Human Rights and International Humanitarian Law, A Practical Guide for Internal Security Operations, 2006, p. 60, § 6.