SS Dakotan was a cargo ship built in 1912 for the American-Hawaiian Steamship Company that served as a transport ship in the United States Army Transport Service in World War I, and then was transferred to the Soviet Union under Lend-Lease in World War II before being finally scrapped in 1969. During World War I, she was taken over by the United States Army as USAT Dakotan. Near the end of that war she was transferred to the United States Navy and commissioned as USS Dakotan (ID-3882). During World War II, the ship was transferred to the Soviet Union and renamed SS Zyrianin.

SS Montanan was a cargo ship built in 1912 for the American-Hawaiian Steamship Company. During World War I service for the United States Army Transport Service, she was known as USAT Montanan. Montanan was built by the Maryland Steel Company as one of eight sister ships for the American-Hawaiian Steamship Company, and was employed in inter-coastal service via the Isthmus of Tehuantepec and the Panama Canal after it opened.