Why is the military spraying barium and aluminum particles in the atmosphere over populated areas?

I've heard a couple of explanations. To combat global warming, the particles reflect UV rays from the sun. The military is experimenting with ways to make the atmosphere more conductive for the HARPE weapon. The military is experimenting with radar jamming techniques. Other reasons I've heard are a bit extreme and involve to much speculation. If anyone has any insight on this or knows of any activists groups out there trying to put a stop to these experiments/practices please respond. Thank you.|||They aren't. It's just normal Contrails. You've been reading those crackpot chem-trail sites again, haven't you?|||As I understand it, tin-foil caps are doing a very effective job at blocking-out most electromagnetic psychotronic mind control carriers that were developed during the Cold War and deployed, secretly, by the Bush Administraton. The spraying of barium and aluminum particles, authorized by President Obama in a classified Executive Order, is designed to offset this method of protection. To my knowledge there's no proof it's working. The recent unsuccessful terrorist attack is evidence.