Key PointsSaronic builds robot warships for the U.S. Navy -- and won a $392 million contract last year.Saronic needs even more money though, and so raised $1.75 billion in private funding last month.These 10 stocks could mint the next wave of millionaires › Who's who in building a new robot navy for the U.S.? Over the years, I've highlighted a handful of usual suspects, from Leidos (NYSE: LDOS) -- builder of the first autonomous Sea Hunter robot…