I was contacted twice by Lockheed recruiters for two separate positions. They each sent me a list of questions to answer, which I put significant time and effort into. After both, I heard not another word from either recruiter, despite several attempts from me asking to close the loop. If I am not selected for a position, that's fine, but it's extremely unprofessional to initiate the interview process and then ghost a candidate. For a company of this size and reputation, I was shocked.