1919–1924

Wyoming transiting the Panama Canal on 26 July 1919

On 1 February, Wyoming steamed out of New York to join the annual fleet maneuvers off Cuba, before returning to New York on 14 April. On 12 May, she left port to help guide a group of Navy Curtiss NC flying boats as they made the first aerial transatlantic crossing. The battleship was back in port by 31 May. She then took on a crew of midshipmen for a training cruise off the Chesapeake Bay and Virginia Capes. After finishing the cruise, Wyoming entered dry dock at the Norfolk Navy Yard on 1 July for a modernization for service in the Pacific.^[2] Her secondary battery was reduced to sixteen 5-inch guns.^[9] After emerging from the shipyard, she became the flagship of BatDiv 6 of the newly designated Pacific Fleet. On 19 July, Wyoming and the rest of the Pacific Fleet departed the east coast, bound for the Pacific. The ships transited the Panama Canal later that month, and reached San Diego, California on 6 August.^[2]

On 9 August, Wyoming moved to San Pedro, where she was based for the next month. She went to the Puget Sound Navy Yard for an overhaul that lasted until 19 April 1920. On 4 May, she was back in San Pedro and resumed her normal routine of fleet maneuvers off the California coast. On 30 August, Wyoming left California for Hawaii, where she participated in more training exercises through September. She then returned to San Diego on 8 October for more maneuvers off the west coast. The ship left San Francisco on 5 January 1921 for a cruise to Central and South American waters; the trip culminated in Valparaíso, Chile, where she was reviewed by the President of Chile Arturo Alessandri Palma on 8 February. Wyoming then returned north, arriving in Puget Sound for repairs on 18 March.^[2]

On 2 August, Wyoming was in Balboa in the Canal Zone, where she picked up Rear Admiral Rodman and a commission traveling from Peru back to New York. She arrived in New York on 19 August and rejoined the Atlantic Fleet. There, she became the flagship of Admiral Hilary P. Jones, the commander of the Atlantic Fleet. Wyoming spent the next three and a half years on the normal routine of winter fleet exercises off Cuba, followed by summer maneuvers off the east coast of the US. Throughout the period, she served as the flagship of Vice Admirals John McDonald, Newton McCully, and Josiah McKean in the Scouting Fleet. In the summer of 1924, she conducted a midshipman training cruise to Europe, and stopped in Torbay, Great Britain, Rotterdam in the Netherlands, Gibraltar, and the Azores.^[2] In January and February 1924, the Navy conducted Fleet Problem II, III, and IV concurrently. During the FP III maneuvers, Wyoming, her sister Arkansas, and the two Florida-class battleships stood in for the new Colorado-class battleships.^[10] During the FP IV portion of the maneuvers, Wyoming served in the "Blue" force, which represented the US Navy. She was attacked by "Black" aircraft, but the umpires judged Wyoming's anti-aircraft fire and the escort fighters provided by Langley to have effectively defended the fleet.^[11]

1925–1930

Wyoming underway in March 1930

On 14 February 1925, Wyoming again passed through the Panama Canal to return to the Pacific. There, she joined fleet exercises off California. She then proceeded to Hawaii, where she remained from late April to early June. She visited San Diego on 18–22 June, and then returned to the east coast via the Panama Canal, arriving in New York on 17 July. A cruise to Cuba and Haiti followed, after which Wyoming returned to the New York Navy Yard for an overhaul that lasted from 23 November to 26 January 1926. During this period, then-Commander William F. Halsey, Jr. came aboard as the ship's executive officer; he served on Wyoming until 4 January 1927.^[2]

Wyoming then returned to the routine of winter maneuvers in the Caribbean and training cruises in the summer. In late August, the ship went to Philadelphia for an extensive modernization. Her old coal-fired boilers were replaced with new oil-fired models and anti-torpedo bulges were added to improve her resistance to underwater damage. The work was completed by 2 November, after which Wyoming conducted a shakedown cruise to Cuba and the Virgin Islands. She was back in Philadelphia on 7 December, and two days later, she returned to her post as the flagship of the Scouting Fleet, flying the flag of Vice Admiral Ashley Robertson.^[2]

Wyoming spent the next three years in the Scouting Fleet. She conducted training cruises with Naval Reserve Officer Training Corps (NROTC) cadets from various universities, including Yale, Harvard, Georgia Tech, and Northwestern. These cruises went throughout the Atlantic, including to the Gulf of Mexico, to the Azores, and to Nova Scotia. While on one of these cruises in November 1928, Wyoming picked up eight survivors from the wrecked steamship SS Vestris; she took them to Norfolk on 16 November. On 19 September 1930, Wyoming was transferred from the Scouting Force to BatDiv 2, where she became the flagship of Rear Admiral Wat Tyler Cluverius Jr. She served here until 4 November, when she was withdrawn from front-line service and became the flagship of the Training Squadron, flying the flag of Rear Admiral Harley H. Christy. Thereafter, she conducted a training cruise to the Gulf of Mexico.^[2]

1931–1941

Wyoming in 1935, after her conversion into a training ship

After returning to Philadelphia on 1 January 1931, Wyoming was placed on reduced commission. Under the terms of the London Naval Treaty signed the previous year, Wyoming was to be demilitarized. During the demilitarization process, her anti-torpedo bulges, side armor, and half of her main battery guns were removed. She was back in service by May, and on the 29th, she took on a crew of midshipmen from Annapolis for a training cruise to Europe, which began on 5 June. While en route on 15 June, Wyoming rescued the disabled submarine O-12 and took it under tow to Queenstown, Northern Ireland. While in Europe, she stopped in Copenhagen, Denmark, Greenock, Scotland, Cadiz, Spain, and Gibraltar. The ship was back in Hampton Roads on 13 August; while on the cruise, Wyoming was reclassified as "AG-17", to reflect her new role as a training ship.^[2]

Wyoming spent the next four years conducting training cruises for midshipmen and NROTC cadets to various destinations, including European ports, the Caribbean, and the Gulf of Mexico. On 18 January 1935, she carried the 2nd Battalion, 4th Marine Regiment, from Norfolk to Puerto Rico for amphibious assault exercises. On 5 January 1937, the ship left Norfolk and steamed to the Pacific via the Panama Canal. She took part in more amphibious assault exercises and gunnery drills at San Clemente Island. On 18 February, during the exercises, a 5-inch shrapnel shell exploded as it was being loaded into one of her guns. The blast killed six Marines and wounded another eleven. Wyoming immediately steamed to San Pedro and transferred the wounded Marines to the hospital ship Relief.^[2]

On 3 March, Wyoming left Los Angeles, bound for the Atlantic. She reached Norfolk on 23 March, where she served as the temporary flagship for Rear Admiral Wilson Brown, the commander of the Training Squadron, from 15 April to 3 June. On 4 June, she left port to conduct a goodwill cruise to Kiel, Germany, arriving on 21 June. There, she visited Admiral Graf Spee. She left Germany on 29 June, stopping in Torbay, Britain, and Funchal, Madeira, and arrived in Norfolk on 3 August. Wyoming resumed her training ship duties for Naval and Merchant Marine Reserve units. She returned to Norfolk Navy Yard for an overhaul that lasted from 16 October to 14 January 1938.^[2]

Wyoming performed her typical routine of training cruises in the Atlantic through 1941. The cruises included another European trip in 1938; she took the midshipmen to Le Havre, France, Copenhagen, and Portsmouth.^[2] After the outbreak of World War II in Europe in September 1939, Wyoming was assigned to a naval reserve force in the Atlantic, alongside the battleships New York, Arkansas, and Texas and the aircraft carrier Ranger.^[12] Wyoming became the flagship of Rear Admiral Randall Jacobs, the commander of the Training, Patrol Force on 2 January 1941. In November, Wyoming became a gunnery training ship. Her first cruise in this new role began on 25 November; she was cruising off Platt's Bank in the Gulf of Maine when she received word of the Japanese attack on Pearl Harbor on 7 December.^[2]