gremlin/E+ via Getty Images Shares of AeroVironment (NASDAQ:AVAV) have been on fire in recent years, being a real upcoming player in a somewhat stable defense environment. The unmanned vehicle producer has been on fire in recent years, as its products are really upcoming in the defense industry and used in global battlefields. I like the track record of the business and its positioning, but fear that commanding valuations do not result in a very compelling risk-reward situation here, as there is quite some ...