2815(d) of the National Defense Authorization Act for Fiscal Year 2000 ( Public Law 106–65 ). 1006. Custer County Airport conveyance (a) Definitions In this section: (1) County The term County means Custer County, South Dakota. (2) Federal land The term Federal land means all right, title, and interest of the United States in and to approximately 65.7 acres of National Forest System land, as generally depicted on the map. (3) Map The term map means the map entitled Custer County Airport Conveyance and dated October 19, 2017. (4) Secretary The term Secretary means the Secretary of Agriculture, acting through the Chief of the Forest Service. (b) Land conveyance (1) In general Subject to the terms and conditions described in paragraph (2), if the County submits to the Secretary an offer to acquire the Federal land for the market value, as determined by the appraisal under paragraph (3), the Secretary shall convey the Federal land to the County. (2) Terms and conditions The conveyance under paragraph (1) shall be— (A) subject to valid existing rights