When did the US start fighting in the Vietnam War?

The Vietnam War started in the year 1959.The Vietnamese War was one of the most brutal battles ever fought. It lasted for a period of 16 years. It exact date on which ceasefire was called was 30th of April 1959. The war was fought between DRV (democratic republic of Vietnam) and the 'Republic of Vietnam.' United States of America had allied with the Republic of Vietnam to fight the Vietnam war.