Navy Lasers, Railgun, and Gun-Launched Guided Projectile: Background and Issues for Congress [October 23, 2018] [open pdf - 2MB]
"This report provides background information and issues for Congress on three new ship-based weapons the Navy is developing that could improve the ability of Navy surface ships to defend themselves against missiles, unmanned aerial vehicles (UAVs), and surface craft: the Surface Navy Laser Weapon System (SNLWS), the electromagnetic railgun (EMRG), and the gun-launched guided projectile (GLGP), previously known as the hypervelocity projectile (HVP). The Navy refers to the initial (i.e., Increment 1) version of SNLWS as HELIOS, an acronym meaning high-energy laser with integrated optical dazzler and surveillance.Any one of these three new weapons, if successfully developed and deployed, might be regarded as a 'game changer' for defending Navy surface ships against enemy missiles and UAVs. If two or three of them are successfully developed and deployed, the result might be considered not just a game changer, but a revolution. Rarely has the Navy had so many potential new types of surface-ship air-defense weapons simultaneously available for development and potential deployment."
CRS Report for Congress, R44175
Congressional Research Service: https://crsreports.congress.gov/