By Steve Holland and Mike Stone WASHINGTON (Reuters) -U.S. President Joe Biden on Tuesday visited a Lockheed Martin Co facility in Alabama that manufactures the anti-tank Javelin missile, putting the spotlight on a weapon that has helped Ukraine fight Russia’s invasion. Biden used the visit to press Congress to approve his proposed $33 billion assistance package for Ukraine, including more than $20 billion in military aid. Biden said his administration was working hard to once again become the biggest producer of semiconductor chips needed to produce Javelin missiles and many other high-techno…