The Department of Defense operates facilities across the U.S. and in many host nations. These facilities impact their surrounding regions, and, in turn, are impacted by their regions. During the 1970s and 1980s, joint planning efforts were initiated through a program of the Defense Office of Economic Adjustment (OEA) to encourage communities to work with defense bases to “plan” across their fence lines. Frequently, these plans revolved around noise issues, and relied upon noise contour maps generated from analysis of aircraft flight paths and blast noise patterns emerging from installation mission activities. In the last decade, the Department of Defense has become even more proactive in addressing across the fence line issues, largely because of growing constraints on mission activities. Installations have been partnering with neighbors to preserve habitat across shared ecoregions, to avoid the increase of incompatible land uses along installation boundaries, to share resources such as utilities, housing and recreational resources, and to plan “sustainable” uses of dwindling regional resources for future years. This presentation will examine efforts to provide data, information and procedures for enhanced “across the fence line” planning between installations and surrounding communities and stakeholders – and identify likely future directions and trends