File:1st Aero Squadron - William Portwood Erwin.jpg
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![File:1st Aero Squadron - William Portwood Erwin.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/1st_Aero_Squadron_-_William_Portwood_Erwin.jpg/500px-1st_Aero_Squadron_-_William_Portwood_Erwin.jpg?20140104151759)
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