river stretching out over 125 acres in the heart of navalgton plastic u.s. gun factory. huge industrial plant of 200 buildings. here is the headquarters of the potomac river naval command where they coordinate communications, transportation, personnel, distribution, legal matters, instruction and repair, -- nevernd medical closer look at some of the major installations and their missions. block after block of great factories and shops. andly arts, fears, roads, rail lines as well as developing and testing laboratories. for the navy of tomorrow. as a prototype laboratory, the first working models and new guns are built for test. there's a factory for new and a producers of intricate weapons that require extreme technical skill and know how in many different fields. let's take a quick look at a gun in the making. after paperwork and many departments, planning, engineering, production and inspection, actual work begins. raw materials for into the processing shops. the pattern is made. parts are forged, shaved and treated. machining.ough finish machining, testing, and final