Provided always, and be it further enacted, That every Soldier enlisted under any Orders or Regulations in force at the passing of this Act, shall henceforth remain entitled to all the Benefit of all the Provisions contained in all such Orders and Regulations made by His Majesty, as shall have been or were in force at the Time of his so enlisting, notwithstanding such Orders or Regulations may be hereafter altered, varied, or annulled, and new Orders or Regulations made in lieu thereof, and notwithstanding this Act or any thing herein contained to the contrary thereof.