Of these mission elements, training and leader development are the most important within the military history program. The program also includes historical activities within organizations without dedicated professional history program personnel, such as historical officers responsible for organizational history. All historical activities fall within the general programmatic categories of collection, interpretation, and instruction. Installation museums not associated with Army schools should be aligned on the installation commander's special staff. Work together to develop instructional programs for Army and branch history and heritage which take advantage of historical collections and facilities.
Historical significance is based upon the commander's perspective and the historian's judgment.
Documentation still in use may be marked for collection at a later time. Museums collect historically significant material and documentary data in any media pertaining to collection of the material history of the branch, organization, region, and installation which they serve. They will ensure that collections are complete and comprehensive and support research and development efforts peculiar to the branches they serve. Historically significant material must be marked and stored to insure preservation. Galleries will also address research and development efforts peculiar to the branches served by the museums.