Concerning retired officer qualification, the Law Enforcement Officers Safety Act currently says, at
18 USC 926C (c) (4):
"[D]uring the most recent 12-month period, [the otherwise qualified former law enforcement officer] has met, at the expense of the individual, the standards for qualification in firearms training for active law enforcement officers, as determined by the former agency of the individual, the
State in which the individual resides or, if the State has not established such standards, either a law enforcement agency within the
State in which the individual resides or the standards used by a certified firearms instructor that is qualified to conduct a
firearms qualification test for active duty officers within that State[.]"
It says nothing more and nothing less. So, nothing else is necessary: not training courses, not background checks, no demonstration of extraordinary skills, no minimum physical fitness requirements, but also no special courses of fire, made easier to allow for advanced decrepitude. It is only required that the individual has successfully completed
any course of fire which is approved for the qualification of active law enforcement officers within the State of residence.