The Mobile Anti-Submarine Training Target (MASTT) Unmanned Underwater Vehicle (UUV) was built in response to the US Navy’s request for a rapid prototype, low cost UUV for Anti-Submarine Warfare (ASW) training. It also provides an optimum platform for conducting threat detection analysis training as well as countermeasure and torpedo system testing. The MASTT UUV is towed to the operation area and then released to execute the required mission profiles in support of tactical training evolutions. The MASTT UUV design and build phase began in October 2010 and was completed in November 2011, just 13 months later. In December 2011 the MASTT UUV arrived at the US Navy Acoustic Research Detachment (ARD) facility in Idaho and successfully completed an extensive 11 month testing and evaluation program. Naval Undersea Warfare Centre (NUWC) San Diego accepted MASTT 1 in December 2012 where it remains operational. The rapid timeline of design, construction, testing and delivery clearly demonstrates the capabilities of MSubs to quickly respond to a broad array of customer requests.