For offenders who were at the time of commission of their offenses subject to his authority and who merit such action, the Secretary concerned shall establish—
(1)
a system for the remission or suspension of the unexecuted part of the sentences of selected offenders;
(2)
a system for the restoration to duty of such offenders who have had the unexecuted part of their sentences remitted or suspended and who have not been discharged; and