Operation Rolling Thunder, a massive bombing campaign by the USAF and US Navy against military and infrastructure targets in North Vietnam, begins. High on the priority list is the bridge at Thanh Ha, a key supply route from Hanoi and Haiphong to the south. A large raid is assembled, and the bridge is attacked by F-105 Thunderchiefs and F-100 Super Sabres. Vicious AA and aggressive MiG-17 fighters await.