; (ii) Federal land on which the removal of vegetation is prohibited or restricted by Act of Congress or Presidential proclamation (including the applicable implementation plan); or (iii) a wilderness study area. (4) Governors concerned The term Governors concerned means the respective Governors who have entered into good neighbor agreements (as defined in section 8206 of the Agricultural Act of 2014 ( 16 U.S.C. 2113a )). (5) Secretary concerned The term Secretary concerned means— (A) the Secretary of the Interior, with respect to public lands; and (B) the Secretary of Agriculture, with respect to National Forest System lands. (6) Treatment programs The term treatment programs means any removal or modification of flammable vegetation including, but not limited to, prescribed fire, mechanical thinning, timber sales, mastication, pruning, slash treatment, or a combination of those methods. (7) Wildland-Urban Interface The term wildland-urban interface has the meaning given the term in section 101 of the Healthy Forests Restoration Act of 2003 ( 16 U.S.C. 6511 ). 4. Categorical exclusion for accelerated treatment programs for the wildland-urban interface (a) Categorical exclusion established Treatment programs described in subsection (b) are a category of actions designated as categorically excluded from the preparation of an environmental assessment or an environmental impact statement under section 102 of the National Environmental Policy Act of 1969 ( 42 U.S.C. 4332 ). (b) Treatment program described The treatment programs described in this subsection are forest management activities carried out by the Secretary concerned to— (1) reduce the risk of wildfire to at-risk communities and at-risk watersheds by prescribing treatment programs in the wildland-urban interface which remove overstocked timber