The air force because they wanted people to leave them alone and blame someone else for the strange stuff and not make a big deal over it. They wanted to keep their top secret aircraft secret from their enemies abroad probably.
People make such a big deal over nothing, just leave them alone they are working for your best interests by making technological advancements to protect you from the other guy and aid you in day to day life. Without our military we would not have had the ideas that layed the foundations for today's internet, let alone such advanced telecommunications. Don't pester them, thank them; they do the people a great good.