 During the Tet Offensive attacks in northern I Corps, many of the detached 20th TASS units returned from their forward bases to the security of Da Nang AB, resulting in longer transit and reduced on-station times for their forward air control missions.On 20 September 1969 a USAF F-4 returning from a strike mission collided with an Air Vietnam Douglas C-54D-10-DC Skymaster (registration XV-NUG) 3 kilometers (1.9 miles) northwest of the airport, taking off part of the C-54's wing, the C-54 crashed into a plowed field, killing 74 of the 75 people on board and two people working in the field.On 8 April 1970, the PAVN shelled and rocketed the base killing 1 Airman and one Marine and damaging barracks and communications facilities.