This defense company's stock has been flying high in 2025.Drone stocks have been doing well in 2025, and Kratos Defense & Security Solutions (KTOS 4.25%) is one of the top performers. It's up 229% on the year as of Oct. 20's market close and has delivered impressive revenue growth -- 17% year over year in its second-quarter earnings.Those are both positive signs. But if you're thinking about investing in Kratos right now, here's why you may want to reconsider.Low earnings, high valuationAfter the rise in it ...