Reference: USA Counterintelligence Glossary

Director of National Intelligence et al (IC), DoD, Intelligence (government)
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Primary Source (USG)

Back-Up Source (OSS)

Phi Beta Iota: This is an extraordinarily good contribution–a virtual compendium of every side of the secret world.  Amusingly it acknowledges that 90% of what we need to know comes from open sources of intelligence without noting the irony that we spend $80 billion on everything other than open sources.  It repeats the US Government mis-conception that open sources are “second-hand,” and it neglects multinational intelligence and counterintelligence precisely because the US Government refuses to be serious about that necessary evolution.  Over-all, an absolute pleasure to read, a serious contribution.