And be it further enacted, That all Officers who now hold any Commission in either of the Two Regiments of London Militia raised by virtue of the said Two Acts passed in the Thirty-sixth and Thirty-ninth Years of the Reign of His said late Majesty, and who shall be appointed to any Commission in the Militia to be raised by virtue of this Act, shall, during the Time they shall respectively hold such Commission, retain the same Rank in the Army as they now hold.