Defense Threat Reduction Agency DTRA Verteidigungsbedrohungsreduktionsagentur Defence Threat Reduction Agency Agencia de Reducción de Amenazas de Defensa Agencia de Reducción de Amenazas de Defensa Agence de réduction des menaces de défense סוכנות להפחתת איומים בתחום הביטחון रक्षा धमिति न्याय एजेंसी 防衛脅威低減局 Agência de Redução de Ameaças de Defesa 国防威胁削减局 DTRA Defense Threat Reduction Agency The Defense Threat Reduction Agency (DTRA) is an agency within the United States Department of Defense (DoD) and is the official Combat Support Agency for countering weapons of mass destruction (chemical, biological, radiological, nuclear, and high explosives).