LTG Luckey pounded continuously the Ready Force X program that has kept the US Army Reserve (select parts of it that rotate on and ongoing basis) able to deploy as part of the Operational Force with relatively little notice. This in addition to the almost twenty years of unit rotations, normally lasting a year with nine months on station, to the various COCOMs, primarily but by no means exclusively CENTCOM.
There is every confidence that LTG Daniels will continue that charge, putting her skills and talents to work finding ways to continue increasing the relevance of the Army Reserve to the total force.
The COVID crisis will exacerbate the training problems short term, and has already resulted in the Reserve system going to a Virtual Battle Assembly (VBS) program, though some units are starting to hold their Annual Training in person. Usually at the home station.
LTG Luckey did a great job.
LTG Daniels will do as well or better.