This United States Army policy, Army Regulation AR 70-38 Research, Development, Test and Evaluation of Materiel for Worldwide Use June 2020, prescribes policies, responsibilities, and planning guidance for inclusion of the global operational environment climatic and natural environment factors in the research, development, test and evaluation of materiel used in combat by the Army.

This regulation applies to the Regular Army, the Army National Guard/Army National Guard of the United States, and the U.S. Army Reserve, unless otherwise stated. It also applies to items of materiel developed for use by the Army unless otherwise stated. It applies to items of materiel developed by another Service to meet Army requirements and where the Army approves the capability requirements documents; has budget responsibility; and is the user.