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FWIW, the 'Chemtrails' (not contrails and discernible from them) were very active for nearly 2 years over much of the US through the deployment of US forces overseas. Once overseas when military activity in the US was stable, they tended to cease. They popped back up coincidentally whenever major phases or operational changes occurred overseas and upon the return of forces back to the US as though they were being tracked perhaps via Open Skies Treaty surveillance.

The most plausible theories I've found so far are that they are associated with either a communications method at senior command level for DOD, a biological WMD innoculation system, or something associated with Open Skies.

FWIW, when they were first observed, even senior flag rank officers in the USAF and seasoned pilots and doctors responsible for flight physiology treated the topic seriously and considered the 'Chemtrails' as a very real phenomenon discernible from condensation trails and a bit mysterious. Some simply considered that perhaps they didn't have a need to know to avoid the awkward consequences.