== Please merge Common types and History and milestones == 

 I have just come to this article from the truly bad article Naval Avation because I want to add a see also section to that article in the hope it inspires someone to write an overview article. 

 In reading this article I found the sections Common types and History and milestones to be overlapping sections which could and should be merged. As the saying goes "a camel is a horse designed by committee", and with theses two separate sections this defiantly looks more like a camel than a horse.