I took the opposite approach while we're in the process of implementing
System Automation:
Just prior to shutting down our JES3, one of the TERMINIT commands is to
invoke a STARTAXR exec that does a SAY to merely initiate a subtask for
later use.
After termination of the AM, it is this subtask that executes and
coordinates taking care of:

   - T DIAG=xx (sets up REIPL)
   - Z EOD
   - V XCF,<sysname>,OFF,REIPL
   - R xx,SYS=<sysname>

I found having System Rexx around after the SA environment had terminated
quite convenient.
I do not expect to use the System Rexx method once PROCOPS has been
customized and configured.

Could/Should the AXRxx subtasks be started SUB=MSTR to release its
dependency on JES? I don't know if that is covered in the documentation.

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