Have you searched for "f35.com" on the F-35 Wikipedia page? There are four mentions of it. Enter the address into your browser. The page exists. It seems to be

Have you searched for "f35.com" on the F-35 Wikipedia page? There are four mentions of it. Enter the address into your browser. The page exists. It seems to be Lockheed Martin's official page for the jet. Your teachers surely won't blame you for using information from that page, even if you've gotten the link from Wikipedia. It is very likely the policy is meant to prevent lazy students from copying text from Wikipedia, not from using the sources mentioned there.