Contrary to rumors of “conspiracy theory”, the Department of Defense first published “Chemtrails” in 1990 as the title to a chemistry course for new pilots attending the esteemed US Air Force Academy. The term “Chemtrails”, and its implied meaning was eventually adopted by civilian observers to describe unusual military jets and later, commercial aircraft contrail emissions. In etymological terms, the origin of a word is very important. Regardless the intended definition, history clearly shows the term “Chemtrails” originated at the US Department of Defense as the title for a Chemistry manual used at the Air Force Academy cadet training program in the early 1990?s. Two editions of the “Chemtrails” manual are known to exist – A 200 page version for the 1990 Fall class and a 232 page version for the 1991 class. The course title “chemtrails” was so popular as to be adopted by the DoD for at least two academic years (1990-1991). See Documents at AirCrap.org.