5 U.S.C. § 8116: Limitations on right to receive compensation

in return for service actually performed; pension for service in the Army, Navy, or Air Force; other benefits administered by the Department of Veterans Affairs unless such benefits are payable for the same injury or the same death; and retired pay, retirement pay, retainer pay, or equivalent pay for service in the Armed Forces or other uniformed services. An individual entitled to benefits under this subchapter because of his injury, or because of the death of an employee, who also is entitled to receive from the United States under a provision of statute other than this subchapter payments or benefits for that injury or death (except proceeds of an insurance policy), because of service by him (or in the case of death, by the deceased) as an employee or in the armed forces, shall elect which benefits he will receive. The individual shall make the election within 1 year after the injury or death or within a further time allowed for good cause by the Secretary of Labor. The election when made is irrevocable, except as otherwise provided by statute. The liability of the United States or an instrumentality thereof under this subchapter or any extension thereof with respect to the injury or death of an employee is exclusive and instead of all other liability of the United States or the instrumentality to the employee, his legal representative, spouse, dependents, next of kin, and any other person otherwise entitled to recover damages from the United States or the instrumentality because of the injury or death in a direct judicial proceeding, in a civil action, or in admiralty, or by an administrative or judicial proceeding under a workmen’s compensation statute or under a Federal tort liability statute. However, this subsection does not apply to a master or a member of a crew of a vessel. benefits received under section 223 of the Social Security Act (on account of disability) shall be subject to reduction on account of benefits paid under this subchapter pursuant to the provisions of section 224 of the Social Security Act; and in the case of benefits received on account of age or death under title II of the Social Security Act, compensation payable under this subchapter based on the Federal service of an employee shall be reduced by the amount of any such social security benefits payable that are attributable to Federal service of that employee covered by chapter 84 of this title. However, eligibility for or receipt of benefits under chapter 84 of this title, or benefits under title II of the Social Security Act by virtue of service covered by chapter 84 of this title, does not affect the right of the employee to compensation for scheduled disabilities specified by section 8107(c) of this title .