In the wake of a series of troubling aircraft mishaps and crashes ― several of which have been fatal ― Air Force Chief of Staff Gen. Dave Goldfein has ordered a one-day safety stand down for all flying and maintenance wings.

“I am directing this operational safety review to allow our commanders to assess and discuss the safety of our operations and to gather feedback from our airmen who are doing the mission every day,” Goldfein said in the Tuesday news release.

The Air Force said the service “is taking swift action to ensure the safety of its force” following the recent crashes, including the May 2 crash of a WC-130 Hercules that killed nine airmen from the Puerto Rico Air National Guard.

Flying and maintenance operations will largely stop on the days when units conduct their safety reviews, which is why the reviews will be spread out over the next few weeks, said Maj. Gen. John Rauch, Air Force chief of safety. There will be some exceptions for units that cannot stop for operational reasons.

“Standing down for a day to do an operational safety review is not something insignificant,” he said.