It’s a very big day. Applause, cheers and deep thumping beats belie the athletic atmosphere. This is no stadium, but a large, festive room on Lockheed Martin’s sprawling campus in Fort Worth. Dozens of students with hundreds of relatives and Lockheed employees are celebrating signing day . Four soon-to-graduate college kids are about to leave Lockheed Martin’s internship program and join the defense company’s engineering team full time.