After entering service, both ships were assigned to the Atlantic Fleet. The ships took part in the normal routine of training and fleet maneuvers off the east coast of the United States and in the Caribbean, interspersed with periodic maintenance. Both ships toured the Mediterranean in late 1913, making stops in Italy and France, among others. In April 1914, "Arkansas" was involved in the occupation of Veracruz during the Mexican Revolution, and "Wyoming" arrived later to support the operation. Two men from "Arkansas" earned the Medal of Honor for their actions during the initial occupation of the city. After the United States declared war on Germany on 6 April 1917, "Wyoming", along with the rest of Battleship Division 9 (BatDiv 9), steamed to Britain to reinforce the Royal Navy's Grand Fleet, stationed in Scapa Flow. "Arkansas" initially remained in the United States, training gun crews for the expanding wartime fleet. In July 1918, she too was sent to Britain. Neither ship saw action during the war, though they were present when the German High Seas Fleet surrendered in November 1918.