Yes, everyone seems to concur that missile units do not get higher attack with chevrons, but merely accuracy. In any case, there is a SIGNIFICANT difference between fresh archers/slingers and seasoned ones. Whether it is the accuracy or attack, but with missile units, increased accuracy is attack. You ever notice how many missiles do not hit targets? Yeah. Chevroned missile units are priceless. My Rhodian Slingers and Cretan Archers are unstoppable with their silver chevrons.