High Quality Content by WIKIPEDIA articles! The Army Map Service of the US Army Corps of Engineers, was the premier map making agency of the US Department of Defense from 1941-1968. The major task of the Army Map Service (AMS) was the compilation, publication and distribution of military topographic maps and related products required by the Armed Forces of the United States. The AMS was also involved in the preparation of extra-terrestrial maps of satellite and planetary bodies; the preparation of national intelligence studies; the establishment of world geodetic control networks by both satellite and conventional triangulation methods; and the logistic military planning of Corps of Engineer items. Another major responsibility of the AMS is to maintain the largest geodetic and topographic data libraries for the Department of Defense.