Any Assignment, Sale, or Contract made after the Commencement of this Act by an Officer, Seaman, or Marine entitled to any Naval Pension,—or by a Person entitled to a Pension as the Widow of an Officer,—or by a Person entitled to an Allowance from the Compassionate Fund,—or by a Person entitled to any Marine Half Pay,—of or in relation to such Pension, Allowance, or Half Pay, shall be void.