1st » General Suharto puts down an apparent coup attempt by the 30 September Movement in Indonesia.
4th » Pope Paul VI arrives in New York, the first Pope to visit the United States of America and the Western hemisphere.
15th » Vietnam War: The Catholic Worker Movement stages an anti-war rally in Manhattan including a public Draft-card burning or burning of a draft card; the first such act to result in arrest under a new amendment to the Selective Service Act.
21st » Comet Ikeya-Seki approaches perihelion, passing 450,000 kilometers (279,617 miles) from the sun.
23rd » Vietnam War: The 1st Cavalry Division (United States) (Airmobile), in conjunction with South Vietnamese forces, launches a new operation seeking to destroy North Vietnamese forces in Pleiku in the II Corps Tactical Zone (the Central Highlands).
28th » Construction on the St. Louis Arch is completed.
30th » Vietnam War: Just miles from Da Nang, United States Marines repel an intense attack by wave after wave of Viet Cong forces, killing 56 guerrillas.