You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What is the establishment year of this military base north of the city of Concord, California at the shore of the Sacramento River and adjacent to Shore Acres, California?" whose answer is 1942.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Travis Air Force Base establishment year
Useful Output:

Doc 1: The Early Years of Travis Air Force Base​​ On May 11, 1943, the Fairfield-Suisun Army Air Base became operational and served as a front line
Doc 2: TRAVIS AIR FORCE BASE, CALIFORNIA, UNITED STATES · 02.08.2018 · Video by Staff Sgt. Traci Keller · 60th Air Mobility Wing.
Doc 3: External link for Travis Phoenix Spark. Industry: Armed Forces. Company size: 11-50 employees. Headquarters: Travis Air Force Base, California. Type: Government
Doc 4: Although Travis AFB has been officially considered habitat for the California tiger salamander since 2004, when it was listed under the
Doc 5: May 17, 1943 signifies the start of Fairfield-Suisun Army Air Base known now Travis Air Force Base, Calif. It was on this date that the Air