In the aftermath of the resignation of Army Secretary Dan Driscoll, multiple sources told CNN they believe Defense Secretary Pete Hegseth is damaging the Army’s efforts to adapt to the modern battlefield as he focuses on culture wars and prioritizing his own image of the “American warfighter,” and pushes out leaders who don’t align with his vision.

In submitting his resignation, a source familiar said Driscoll brought up “concerns with the administration surrounding Army transformation and readiness and Hegseth’s blocking those efforts specifically by firing the generals who were responsible.”

Driscoll announced Tuesday evening that Wednesday would be his “last full day in the role.”

Multiple sources agreed with the concerns Driscoll raised: that Hegseth is damaging the Army’s efforts to modernize and adapt to the 21st century battlefield environment – where drone warfare is becoming increasingly important – by firing or pushing out leaders who were spearheading those efforts.

“It’s critical that you have key leaders that understand technology and have the temperament to deal with industry and turn that into the formation,” a former senior Army official said. “When you fire these guys for arbitrary reasons, it creates confusion and a void … the Army is enduring turbulence right now.”