(a) For the purpose of this section—

(1) the term "excepted agency" means—

(A) the Central Intelligence Agency;

(B) the Defense Intelligence Agency;

(C) the National Security Agency;

(D) the Federal Bureau of Investigation;

(E) the National Geospatial-Intelligence Agency; and

(F) as determined by the President, any Executive agency or unit thereof, the principal function of which is the conduct of foreign intelligence or counterintelligence activities; and

(2) the term "head of an excepted agency" means—

(A) with respect to the Central Intelligence Agency, the Director of Central Intelligence;

(B) with respect to the Defense Intelligence Agency, the Director of the Defense Intelligence Agency;

(C) with respect to the National Security Agency, the Director of the National Security Agency;

(D) with respect to the Federal Bureau of Investigation, the Director of the Federal Bureau of Investigation;

(E) with respect to the National Geospatial-Intelligence Agency, the Director of the National Geospatial-Intelligence Agency; and

(F) with respect to an Executive agency designated under paragraph (1)(F), the head of such Executive agency, and with respect to a unit of an Executive agency designated under paragraph (1)(F), such individual as the President may determine.

(b)

(1) The head of an excepted agency shall, by regulation, establish a program under which annual leave accrued or accumulated by an employee of such agency may be transferred to the annual leave account of any other employee of such agency if such other employee requires additional leave because of a medical emergency.

(2) To the extent practicable, and consistent with the protection of intelligence sources and methods (if applicable), each program under this subsection shall be established—

(A) in a manner consistent with the provisions of this subchapter applicable to the program; and

(B) without regard to any provisions relating to transfers or restorations of leave between employees in different agencies.

(c)

(1) Notwithstanding any provision of subsection (b), the head of an excepted agency may, at his sole discretion, by regulation establish a program under which an individual employed in or under such excepted agency may participate in a leave transfer program established under the provisions of this subchapter outside of this section, including provisions permitting the transfer of annual leave accrued or accumulated by such employee to, or permitting such employee to receive transferred leave from, an employee of any other agency (including another excepted agency having a program under this subsection).

(2) To the extent practicable and consistent with the protection of intelligence sources and methods, any program established under paragraph (1) shall be consistent with the provisions of this subchapter outside of this section and with any regulations issued by the Office of Personnel Management implementing this subchapter.

(d) The Office shall provide the head of an excepted agency with such advice and assistance as the head of such agency may request in order to carry out the purposes of this section.