Lockheed Martin Structural Assembler Senior interview questions

The interview process was smooth but I left there confused because I was told my background skills were weak and did not receive an offer. With the company paying for me to travel there for a interview you would think the experience block was checked already. I left confused because chatting with the group I had more relevant experience than most. So I don't know what went wrong I answered all the questions correctly and confident. I did express my ambition to progress off the shop floor eventually and I feel that may have hurt me.