The analysis of the defense related to economic activities shows a geographic concentration that makes the disarmament issues a challenge for a number of limited regions and localities. In Québec, disarmament is a special concern for the Montréal region that concentrates 63 % of the defense economy of the province. The adjustment of the defense economy is a junction of several economic problems; because it is linked to the high technology manufacturing sectors and high skilled labor force and affects the most dynamic sectors in research and development.