subject to subsections (c) and (d) of section 7014 of this title, prepare for such employment of the Army, and for such recruiting, organizing, supplying, equipping (including those aspects of research and development assigned by the Secretary of the Army), training, servicing, mobilizing, demobilizing, administering, and maintaining of the Army, as will assist in the execution of any power, duty, or function of the Secretary or the Chief of Staff;

investigate and report upon the efficiency of the Army and its preparation to support military operations by combatant commands;

prepare detailed instructions for the execution of approved plans and supervise the execution of those plans and instructions;

as directed by the Secretary or the Chief of Staff, coordinate the action of organizations of the Army; and

perform such other duties, not otherwise assigned by law, as may be prescribed by the Secretary.