Originally Posted by MobileMark

Sorry but if you give a gun to a highly trained law enforcement officer and he fires it unintentionally, then that is reckless. Reckless because he either ignored established procedure or he forgot/was unaware of it.

If he ignored it then I would say that definitely showed "defiant disregard for danger or consequences" on the officer's part

If he forgot/was unaware of it then I would say that definitely showed "defiant disregard for danger or consequences" on the part of whoever issued him with the gun.

However you look at it "reckless endangerment" seems a reasonable description to me.