; (2) the person would create an unreasonable disruption of the use and enjoyment by the public of the System unit; (3) the activity would impede the routine, emergency, or otherwise necessary management and staff operations on the System unit; or (4) the filming or still photography activity poses a health or safety risk to the public. (d) Processing of permit applications (1) In general The Secretary shall establish a process to ensure that the Secretary responds in a timely manner to an application for a permit for a filming or still photography activity required under subsection (a)(4). (2) Coordination If a permit is required under this section for 2 or more Federal agencies or System units, the Secretary and the head of any other applicable Federal agency, as applicable, shall, to the maximum extent practicable, coordinate permit processing procedures, including through the use of identifying a lead agency or lead System unit— (A) to review the application for the permit; (B) to issue the permit