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: "when did the united states sent troops to vietnam?" whose answer is November 1963.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the united states send troops to vietnam
Useful Output:

Doc 1: July 1965: President Johnson calls for 50,000 more ground troops to be sent to Vietnam, increasing the draft to 35,000 each month. • August 1965
Doc 2: Johnson launched a bombing campaign of the north and began sending combat troops, dramatically increasing deployment to 184,000 by the end of 1965, and to
Doc 3: Assuming a more active role in 1961, the United States sent the first of 11,000 military advisors to South Vietnam.
Doc 4: The U.S. military presence in Vietnam peaked in April 1969, with 543,000 military personnel stationed in the country. By the end of the U.S. involvement, more
Doc 5: Two months after President Nixon announced a peace agreement, American forces left Vietnam, on March 29, 1973.