The Weapons Systems Evaluation Group (abbreviated WSEG) was formed in 1949 to carry out Operational Research work for the Joint Chiefs of Staff of the United States Army and the United States Secretary of Defense.
[1][2] The group collaborated with Israel in evaluating the effectiveness of Soviet weapons during the Cold War.
[3] The first Research Director was Philip M. Morse, who served a year and a half before returning to MIT in the summer of 1950.
During his time with the WSEG Everett worked on various studies of the Minuteman missile project, which was then starting.
Together with George E. Pugh he wrote an influential study The Distribution and Effects of Fallout in Large Nuclear Weapon Campaigns.