; and (ii) enhancing the capability of Department personnel to perform primary mission responsibilities, including the number of Department personnel not removed from their primary mission responsibilities by reason of the performance of covered services by contractor personnel. (C) An assessment with respect to the benefits of contractor personnel performing covered services, including whether the performance of such services by contractor personnel is more efficient or effective than the performance of such services by Department employees. (D) An assessment of opportunities to increase the efficiency of the Department with respect to contracting, including whether Department-wide contract vehicles for covered services would be the most cost effective option for the performance of covered services. (E) A strategy to improve the procurement and delivery of covered services through contracts during the five-year period beginning on the date of the enactment of this Act to— (i) achieve the best value for the Department through the use of full and open competition