To amend the Sikes Act to promote the use of cooperative agreements under such Act for land management related to Department of Defense installations and to amend title 10, United States Code, to facilitate interagency cooperation in conservation programs.

Amends the Sikes Act (conservation programs on federal lands) to allow funds appropriated to the Department of Defense (DOD) to be obligated for funding an endowment for the costs of cooperative agreements for maintenance and improvement of natural resources located off of military installations and state-owned National Guard installations but that are related to current or anticipated military activities.

Allows the recipient of funds provided by the Secretary of Defense or the Secretary of the military department concerned under a natural resources cooperative agreement to use such funds to satisfy any matching funds or cost-sharing requirement of the Departments of Agriculture (USDA), Commerce, or the Interior.