Navy Large Unmanned Surface and Undersea Vehicles: Background and Issues for Congress [Updated November 15, 2019] [open pdf - 3MB]
From the Introduction: "This report provides background information and potential issues for Congress for three types of unmanned vehicles (UVs) that the Navy wants to develop and procure in FY2020 and beyond:  Large Unmanned Surface Vehicles (LUSVs);  Medium Unmanned Surface Vehicles (MUSVs); and  Extra-large Unmanned Undersea Vehicles (XLUUVs). [...] The issue for Congress is whether to approve, reject, or modify the Navy's acquisition strategies and FY2020 funding requests for these three types of UVs. The Navy's proposals for developing and procuring them pose a number of oversight issues for Congress. Congress's decisions on these issues could substantially affect Navy capabilities and funding requirements and the shipbuilding and UV industrial bases."
CRS Report for Congress, R45757
Congressional Research Service: https://crsreports.congress.gov/