You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Dwight_D._Eisenhower

Context:
After the Japanese attack on Pearl Harbor, Eisenhower was assigned to the General Staff in Washington, where he served until June 1942 with responsibility for creating the major war plans to defeat Japan and Germany. He was appointed Deputy Chief in charge of Pacific Defenses under the Chief of War Plans Division (WPD), General Leonard T. Gerow, and then succeeded Gerow as Chief of the War Plans Division. Next, he was appointed Assistant Chief of Staff in charge of the new Operations Division (which replaced WPD) under Chief of Staff General George C. Marshall, who spotted talent and promoted accordingly.

Question:
What was Eisenhower's title in the Operations Division?

Assistant Chief of Staff