In those cases where a medal, or a bar, emblem, or insignia in lieu thereof, awarded pursuant to this chapter has been stolen, lost, destroyed, or rendered unfit for use without fault or neglect on the part of the person to whom it was awarded, such medal, or bar, emblem, or insignia in lieu thereof, shall be replaced without charge, or, in the discretion of the Secretary, upon condition that the Government is reimbursed for the cost thereof.