of the military forces of the United States as the Secretary of the Army or Secretary of the Air Force may think best, to receive military instruction there. The Secretary of the Army of Secretary of the Air Force may detail instructors from the Regular Army or Regular Air Force, respectively, for those forces during their exercises.
(b) Regulations.—The Secretary of the Army or Secretary of the Air Force may prescribe regulations governing the assembling of the National Guard or militia of the States on the maneuvering grounds.
§ 103303. Performance of duties of commissions
The duties of commissions in charge of national military parks shall be performed under the direction of the Secretary.
§ 103304. Recovery of land withheld
(a) Civil Action.—The United States may bring a civil action in the courts of the United States against a person to whom land lying within a national military park has been leased that refuses to give up possession of the land to the United States after the termination of the lease, and after possession has been demanded for the United States by the park superintendent, or against a person retaining possession of land lying within the boundary of a national military park that the person has sold to the United States for park purposes and received payment therefor, after possession of the land has been demanded for the United States by the park superintendent, to recover possession of the land withheld. The civil action shall be brought according to the statutes of the State in which the national military park is situated.
(b) Trespass.—A person described in subsection (a) shall be guilty of trespass.
§ 103305. Travel expenses incident to study of battlefields
Mileage of officers of the Army and actual expenses of civilian employees traveling on duty in connection with the studies, surveys, and field investigations of battlefields shall be paid from the appropriations made to meet expenses for those purposes.
§ 103306. Studies
(a) Study of Battlefields for Commemorative Purposes.—The Secretary of the Army may make studies and investigations and, where necessary, surveys of all battlefields within the continental limits of the United States on which troops of the United States or of the original 13 colonies have been engaged against a common enemy, with a view to preparing a general plan and such detailed projects as may be required for properly commemorating such battlefields or other adjacent points of historic and military interest.
(b) Inclusion of Estimate of Cost of Projected Surveys in Appropriation Estimates.—The Secretary of the Army shall include annually in the Department of the Interior appropriation estimates a list of the battlefields for which surveys or other field investigations are planned for the fiscal year in question, with the estimated cost of making each survey or other field investigation.
(c) Purchase of Real Estate for National Military Park Purposes.—No real estate shall be purchased for national military
