Northrop Grumman interview questions

I was contacted by a recruiter who made it seem like I was a perfect fit for their HR team, so much so that I was being considered for multiple positions. Somehow, the positions magically disappeared. Really, are these recruiters necessary? They provide false hope to people and then disappear into the ether when you ask a followup question. Don't promise something you have no control over. Negative taste in my mouth now regarding Northrop Grumman.