Sec. 3. _And be it further enacted_, That the President shall, by and with the advice and consent of the Senate, appoint two assistant commissioners in addition to those authorized by the act to which this is an amendment, who shall give like bonds and receive the same annual salary provided in said act, and each of the assistant commissioners of the bureau shall have charge of one district containing such refugees or freedmen, to be assigned him by the Commissioner, with the approval of the President. And the Commissioner shall, under the direction of the President, and so far as the same shall be, in his judgment, necessary for the efficient and economical administration of the affairs of the bureau, appoint such agents, clerks, and assistants as maybe required for the proper conduct of the bureau. Military officers or enlisted men may be detailed for service and assigned to duty under this act; and the President may, if in his judgment safe and judicious so to do, detail from the army all the officers and agents of this bureau; but no officer so assigned shall have increase of pay or allowances. Each agent or clerk, not heretofore authorized by law, not being a military officer, shall have an annual salary of not less than five hundred dollars, nor more than twelve hundred dollars, according to the service required of him. And it shall be the duty of the Commissioner, when it can be done consistently with public interest, to appoint, as assistant commissioners, agents, and clerks, such men as have proved their loyalty by faithful service in the armies of the Union during the rebellion. And all persons appointed to service under this act and the act to which this is an amendment shall be so far deemed in the military service of the United States as to be under the military jurisdiction, and entitled to the military protection of the government while in discharge of the duties of their office. Sec. 4. _And be it further enacted_, That officers of the Veteran Reserve Corps or of the volunteer service, now on duty in the Freedmen's Bureau as assistant commissioners, agents, medical officers, or in other capacities, whose regiments or corps have been or may hereafter be mustered out of service, may be retained upon such duty as officers of said bureau, with the same compensation as is now provided by law for their respective grades; and the Secretary of War shall have power to fill vacancies until other officers can be detailed in their places without detriment to the public service.