Miss. Code § 3-5-3
The governor, upon application made to him in writing, on behalf of the United States, for the purpose of acquiring and holding lands or using any part of a public road of any county within the limits of this state, for the purpose of making, building, or constructing levees, canals, or any other works in connection with the improvement of rivers and harbors, or as a site for a fort, magazine, arsenal, dockyard, courthouse, custom house, lighthouse, post office, or other needful buildings, or for the purpose of locating and maintaining national military parks, or for any other public works or purposes accompanied by proper evidence of the purchase of such lands, or the consent of the board of supervisors of the proper county for such public roads to be used for said purpose, is authorized for the state to cede jurisdiction thereof to the United States for the purpose of the cession and none other.
Miss. Code § 3-5-3