Which statement is correct about US involvement in the Vietnam War in the 1960s?

U.S. troop levels in Vietnam rose dramatically during the 1960s, from a small advisory presence early in the decade to hundreds of thousands of troops by its end. This makes “US troop numbers increased drastically over the course of the decade” correct. The decline in troop involvement began later, with U.S. withdrawals starting in 1969, so it was not yet the overall trend across the decade.

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