5 U.S.C. § 8431

Certain transfers to be treated as a separation

(a)

For purposes of this subchapter, separation from Government employment includes a transfer from a position that is subject to one of the retirement systems described in subsection (b) to a position that is not subject to any of them.

(b)

The retirement systems described in this subsection are—

(1)

the retirement system under this chapter;

(2)

the retirement system under subchapter III of chapter 83; and

(3)

any other retirement system under which individuals may contribute to the Thrift Savings Fund through withholdings from pay.

(Added Pub. L. 106–168, title II, § 203(a)(1) , Dec. 12, 1999 , 113 Stat. 1820 .)