With Driscoll's resignation, the service has lost its leaders spearheading Army modernization. Those initiatives are now on uncertain footing.

Dan Driscoll, a former soldier who came into the roll from the finance world, reportedly had a strained relationship with Defense Secretary Pete Hegseth.

Tensions were reported between Hegseth and Driscoll, who was well-liked in the military and regarded as a Trump 2.0 power player.