Peer de Silva

Peer de Silva, a West Point graduate and the only resident officer at Los Alamos with that background, served as the laboratory’s chief resident security officer. The book depicts him chiefly through his wary encounters with J. Robert Oppenheimer: a security official who treated informality and left-wing associations as grounds for suspicion, and a scientific director who resisted allowing those suspicions to govern laboratory life.

Position and Security Role

De Silva operated within the Army’s security apparatus at Los Alamos, where counterintelligence officers scrutinized the scientists and their associates. His authority brought him into contact with Oppenheimer over the political histories of people working at the laboratory. When De Silva challenged Oppenheimer about Robert Serber’s former Communist activities, Oppenheimer did not deny knowing about them. He said Serber had told him, before coming to Los Alamos, and that he had required Serber to end his political activity. Oppenheimer’s confidence rested on Serber’s promise: “Serber promised me he would, therefore, I believe him.” De Silva regarded this assurance as evidence of Oppenheimer’s naïveté, or worse.

Clashes with Oppenheimer

A confrontation over ordinary workplace etiquette revealed how far apart the two men were. De Silva barged into one of Oppenheimer’s regular Friday meetings of group leaders to complain that a scientist had sat on the corner of his desk without asking permission. The complaint drew amusement from the room; Oppenheimer answered, “In this laboratory, Captain, anybody can sit on anybody’s desk.” The exchange made the laboratory’s informal norms a direct challenge to De Silva’s sense of security discipline and personal authority.

Oppenheimer’s defense of people with left-wing pasts further sharpened the divide. He had appointed David Hawkins, a former Communist Party member, to the laboratory’s security committee, trusted his abilities, and considered him loyal. De Silva, already described as profoundly suspicious of everyone, saw that appointment as additional cause for concern. The disagreement was not simply about whether a person had once been politically active: Oppenheimer distinguished between reformist politics and revolutionary loyalty, while De Silva’s suspicion extended to the people Oppenheimer chose to trust.

Significance

De Silva’s encounters with Oppenheimer illustrate the strain between the Army’s counterintelligence culture and the collaborative, comparatively informal life Oppenheimer tried to sustain among the scientists. Oppenheimer resisted restrictions that threatened scientific discussion and stood by colleagues whose political histories attracted scrutiny; De Silva treated such trust as a security weakness. The book offers no account of De Silva’s later career or personal life, but his role at Los Alamos makes visible a central wartime conflict: the same community asked to produce a secret weapon also depended on relationships and exchanges that security officers were charged with policing.