War Research Service, the official US successor agency to the WBC Committee, according to Regis established November 1942 by the Federal Security Agency (according to Williams and Wallace, in March 1943), with George W. Merck as its first director. Early on Paul Fildes and David Henderson came to Washington to meet with Merck and officials from the US Army Chemical Warfare Service Fildes and Henderson advised the Americans about the BW testing conducted on Gruinard Island. Fildes requested that the US manufacture large quantities of anthrax and approximately three kilograms of botulinum toxin as soon as possible. Four principal sites were selected for BW research: Horn Island, Mississippi; the Dugway CW testing facility in Utah; a munitions manufacturing complex at Terre Haute, Indiana; and Camp Detrick.