Portal:United States Congress, United States Statutes at Large (1845)
“ The functions of the engineers being generally confined to the most elevated branch of military science, they are not to assume, nor are they subject to be ordered on any duty beyond the line of their immediate profession, except by the special order of the President of the United States; but they are to receive every mark of respect, to which their rank in the army may entitle them, respectively, and are liable to be transferred, at the discretion of the President, from one corps to another, regard being paid to rank. ”
