the 156th infantry and 199th infantry (less 3d battalion) consolidated on 1 july 1959 and reorganized as the 156th infantry, a parent regiment under the combat arms regimental system, to consist of the 1st, 2nd, and 3rd battle groups, elements of the 39th infantry division (3d battalion, 199th infantry, concurrently converted and redesignated as the 539th transportation battalion - hereafter separate lineage).