Indian Runner duck the Pekin duck. As soon as the Indian Runners became fashionable, a demand for egg-layers and general purpose breeds developed. Using Runners crossed to Rouens, Aylesburys and Cayugas (the large black American breed), William Cook produced his famous Orpington Ducks. Mrs Campbell crossed her fawn-and-white Runner duck to a Rouen drake to create the Campbell ducks introduced in 1898. Later, she introduced wild mallard blood and managed to create the most prolific egg-layer, the Khaki Campbell (announced in 1901). Other breeds followed, some of which emerged as direct mutations of the Khaki Campbell, along with crosses back to Indian Runners,
Khaki United States Army adopted khaki during the Spanish–American War (1898), replacing their traditional blue field uniforms. The United States Navy and United States Marine Corps followed suit, authorizing khaki field and work uniforms. When khaki was adopted for the continental British Service Dress in 1902, the shade chosen had a clearly darker and more green hue. This color was adopted with minor variations by all the British Empire Armies and the US expeditionary force of World War I, in the latter under the name olive drab. This shade of brown-green remained in use by many countries throughout the two World