 During 1969 40 concrete and steel "Wonderarch" aircraft shelters were constructed at the base.On 1 February 1970 the base was hit by a People's Army of Vietnam (PAVN) rocket attack killing one Airman and wounding 15 others.In March B Flight 18th SOS moved to Da Nang AB, while A Flight 17th Special Operations Squadron (17th SOS) equipped with AC-119Gs moving from Tuy Hoa Air Base replaced them at Phù Cát AB.