The Comptroller of the Currency is authorized to employ such additional examiners, clerks, and other employees as he deems necessary to carry out the provisions of sections 4, 6, 9, 10, 1151 to 1318, and 1322 of this title and to assign to duty in the office of his bureau in Washington such examiners and assistant examiners as he shall deem necessary to assist in the performance of the work of that bureau