One of two electromagnetic railgun prototypes on display aboard joint high speed vessel USS Millinocket (JHSV 3) in port at Naval Base San Diego. The railguns are being displayed in San Diego as part of the Electromagnetic Launch Symposium, which brought together representatives from the U.S. and allied navies, industry and academia to discuss directed energy technologies. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kristopher Kirsop/Released)