be on a regular work assignment in the element for all purposes. The written agreement established under subsection (c)(1) shall address the specific terms and conditions related to the employee’s continued status as a Federal employee. (2) Requirements In establishing a temporary detail of an employee of an element of the intelligence community to a private-sector organization, the head of the element shall— (A) certify that the temporary detail of such employee shall not have an adverse or negative impact on mission attainment or organizational capabilities associated with the detail