What is "decertified"

Usage examples of "decertified".

He had managed to argue that to various people who, despite the unit being decertified for combat operations after two previous trips to the sandbox, had kept him from being relieved and forcibly retired.

But if the school's poor performance persisted, the school itself would be decertified, closed, and the children transferred to other institutions.

And all the AIM-54C missiles in the fleet had been decertified for several months, taking away what should have been the most capable air-to-air missile in the Navy.

Of the six remaining ASAT missiles, three had been decertified by the man for cracks in the solid-fuel propellant.

Lewis Runyon was a decertified physician who had tried to set her up as a drug dealer until Cazaux caught up with him.