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Susan LaChance (left), of the United States Postal Service (USPS) along with a representative from the Iowa Governors Office unveil one of three new stamps honoring US Army (USA) Captain (CPT) Meriwether Lewis and CPT William Clark, the leaders of the 1804-1806 Lewis and Clark expedition. The stamps were simultaneously unveiled in 11 states along the trail of the expedition. Sioux City, Iowa is where Sergeant Floyd, the only person to die on the expedition, is buried