190516-N-YM590-1008 MASSACHUSETTS BAY (May 16, 2019) Mineman 3rd Class Matthew PopovichJudge performs maintenance on the Knifefish unmanned undersea vehicle (UUV) during an operational test conducted by members from Operational Test and Evaluation Force (OPTEVFOR). Knifefish is a medium-class mine countermeasure UUV designed for deployment off the LCS. OPTEVFOR is the Navy’s sole test and evaluation organization for surface, air, and undersea warfare, along with various other programs which impact the Navy’s overall mission. (U.S. Navy photo by Mass Communication Specialist 1st Class Brian M. Brooks/RELEASED)