Voir http://psk.blog.24heures.ch/archive/2017/12/31/us-army-modernisation-des-rc-12-guardrail-864966.html

Sur le Guardian lire https://en.wikipedia.org/wiki/Beechcraft_RC-12_Guardrail

Sur le « SIGINT » : https://en.wikipedia.org/wiki/Signals_intelligence_operational_platforms_by_nation

https://en.wikipedia.org/wiki/Signals_intelligence

Signals intelligence (SIGINT) is intelligence-gathering by interception of signals, whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication (electronic intelligence—abbreviated to ELINT). Signals intelligence is a subset of intelligence collection management.