Government officials tried to allay public concern by explaining these were 'condensation vapor trails' (contrails) caused by normal jet engine exhausts at high altitude.While this may have fooled the Sheeple, those more astute noted that, unlike contrails which quickly dissipate, these trails lingered, often for hours.Word eventually began leaking out that chemicals were being sprayed by large, unmarked aircraft, and that this was occurring with regularity across the entire nation as part of a secret military black ops program.