As a result of the attack, Diệm ordered that all RVNAF aircraft be grounded and all aerial combat missions were suspended while his security officials investigated fighter pilots for any possible anti-regime tendencies. This was achieved by placing tanks on the runway at Bien Hoa Air Base. Without assistance from accompanying fighter craft, it was deemed too risky for American helicopters to operate in the jungles against the VC. On 2 March, three days after the attack, Diệm allowed the air force to resume combat operations, having concluded that Cử and Quốc's sentiments were not representative of the air force. For a few days after the attack, the areas around the palace were cordoned off and tanks were stationed at prominent streets in the capital.