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![[Envelope from the United States Signal Corps addressed to First Lieutenant Hamilton Coolidge in Toul, France, circa 1917-1918]](https://digitalcollections.museumofflight.org/files/square_thumbnails/aab0bfba113f2d64c7eced67e46cdc67.jpg "[Envelope from the United States Signal Corps addressed to First Lieutenant Hamilton Coolidge in Toul, France, circa 1917-1918]")
Envelope from the United States Signal Corps addressed to First Lieutenant Hamilton Coolidge in Toul, France, circa 1917-1918.
![[Envelope for Army Signal Corps Aviation School]](https://digitalcollections.museumofflight.org/files/square_thumbnails/5a9cfb2c4085b453896eec00e8590f01.jpg "[Envelope for Army Signal Corps Aviation School]")
Envelope for the United States Army Signal Corps Aviation School at Ebert Field, Arkansas, circa 1918.Item included in Clyde Pangborn's officer service record.