Alpha Bravo Charlie, by Chris Demarest, Margaret K. McElderry Books, 2005.
My Kindergarten son was allowed to dress up for Hallowe'en at his school, as long as it was as a character from a book. My son wanted to be a pilot, and my first thought was "The Little Prince", but not many Kindergarten students read "The Little Prince". Then I remembered Chris Demarest. Chris Demarest is kind of my go-to guy for military-themed books, and mostly because of his amazingly timeless artwork.
My son dressed up as a pilot for the Storybook parade at his school, and he carried this book. And he loves this book, because it is an alphabet book that features pilots.