At the end of May 1942, Eisenhower accompanied Lt. Gen. Henry H. Arnold, commanding general of the Army Air Forces, to London to assess the effectiveness of the theater commander in England, Maj. Gen. James E. Chaney. He returned to Washington on June 3 with a pessimistic assessment, stating he had an "uneasy feeling" about Chaney and his staff. On June 23, 1942, he returned to London as Commanding General, European Theater of Operations (ETOUSA), based in London and with a house on Coombe, Kingston upon Thames, and replaced Chaney. He was promoted to lieutenant general on July 7.

As of May 1942, who commanded the Army Air Forces?