القاعدة ذات الصلة
Jordan
Practice Relating to Rule 8. Definition of Military Objectives
Prior to the adoption of UN General Assembly Resolution 47/37 in 1992 on the protection of the environment in times of armed conflict, Jordan and the United States submitted a memorandum to the Sixth Committee of the UN General Assembly entitled “International Law Providing Protection to the Environment in Times of Armed Conflict”. The memorandum stated that “the customary rule that, in so far as objects are concerned, military objectives are limited to those objects which by their nature, location, purpose or use make an effective contribution to military action and whose total or partial destruction, capture or neutralization, in the circumstances ruling at the time, offers a definite military advantage” provides protection for the environment in times of armed conflict. 
Jordan and United States, International Law Providing Protection to the Environment in Times of Armed Conflict, annexed to Letter dated 28 September 1992 to the Chairman of the Sixth Committee of the UN General Assembly, UN Doc. A/C.6/47/3, 28 September 1992, § 1(i).
The Report on the Practice of Jordan states that the definition of a military objective set forth in Article 52(2) of the 1977 Additional Protocol I is part of customary international law. 
Report on the Practice of Jordan, 1997, Chapter 1.3.