agent (intelligence)

agent / agent network / agents

CW agent (chemical warfare agent)

obscurant agent (vision-restricting agent)

damage agent / damaging agent

secret agent intelligence

agent inside the intelligence service

agent with intelligence service

counter-intelligence agent

Secret Intelligence Service (SIS) / Military Intelligence, Section 6 (MI6)

tactical intelligence / combat intelligence

undeclared member of the intelligence or counter-intelligence agencies

Defence intelligence of Ukraine (DIU) / Main Directorate of Intelligence of the MoD of Ukraine

agent vapor

anti-plant agent

automatic chemical agent alarm

biological agent

blister agent/ gas

blood agent

chemical agent detector

chemical agent detector kit

chemical agent detector paper

chemical agent dissemination

choking agent / gas

corrosive agent

deep-cover agent

defoliating agent

depolymerizing agent

germ warfare agent

harassing agent

ignition agent

incapacitating agent

incendiary agent