Is it still a big thing? For what purpose?
This is an official government document—the debunkers are going to have a hard time denying it is true.
I don't deny cloud seeding has occurred.
These days .gov classifies all sorts of stuff.
Over-classification is very common these days.
I have no clue what they are doing today—there is no way I would claim that the “chemtrail” folks are crazy conspiracy folks given the reality of over the top government secrecy—and stupidity.