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Watch Sworn to Secrecy: Secrets of War Season 4 Episode 5 Online
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- COUNTRIES: United States of America,South Korea,United Kingdom,France,Germany,Russia,Vietnam
- Subtitles: English
From mustard gas artillery shells used along the trenches in WWI to the U.S. gas stockpiles in the Pacific during WWII, to the Iraqi gassing of the Kurds, chemical warfare has long been shrouded in a veil of secrecy.
