1. US Navy-Tonkin Gulf Incident; a naval battle between the North Vietnamese Navy 135th Torpedo Boat Squadron and the US Navy's destroyer USS Maddox. This engagement plus the 04 August 1964 incident started the conventional war with North Vietnam.
2. US Army-Operation Lam Son 719, the US Army's last major offensive of the Vietnam War in 1971.
3. US Air Force-Operation Linebacker II, the Strategic Air Commands (B52s) maximum effort bombing campaign to break the back of the North Vietnamese high command in 1972.