The Secretary is authorized to acquire (by purchase, lease, condemnation, or otherwise), construct, improve, repair, operate, and maintain laboratories, research and testing sites and facilities, quarters and related accommodations for employees and dependents of employees of the Department, personal property (including patents), or any interest therein, as the Secretary deems necessary; and to provide by contract or otherwise for eating facilities and other necessary facilities for the health and welfare of employees of the Department at its installations and purchase and maintain equipment therefor.