If a civilian American citizen or his dependents receives or has
received from the United States any payments on account of the same
injury or death, or from his employer in the form of wages or payments
in lieu of wages, or in any form of support or compensation (including
workmen's compensation) in respect to the same objects, the benefits
under this subchapter shall be diminished in the case of an injured
person by the amount of payments such injured person received on account
of the same injury or disability, or in the case of dependents, by the
amount of payments such dependents of the deceased civilian American
citizen received on account of the same death, as the case may be.