WASHINGTON (AP) — Adm. Daryl Caudle took over as the Navy’s highest-ranking officer Monday, ending a six-month vacancy created by the Trump administration's firing of his predecessor.

Caudle became chief of naval operations as Defense Secretary Pete Hegseth has ousted a growing list of military leaders with little or no explanation. Remarks at a swearing-in ceremony at Washington Navy Yard offered several nods to the admiral being in close alignment with the Trump administration leaders above him.

In February, Hegseth fired Caudle's predecessor, Adm. Lisa Franchetti, without explanation. Neither Caudle nor Navy Secretary John Phelan addressed the ouster at the ceremony Monday, though Franchetti was among several former chiefs of naval operations in attendance.

Franchetti had been the second woman ever to be promoted to four-star admiral and is among several female military leaders fired by the Trump administration. She was ousted the same day as Air Force Gen. CQ Brown Jr. as chairman of the Joint Chiefs of Staff.

Phelan, the Navy's civilian leader, described the sea service as rife with issues like “decaying shipyards, inadequate maintenance, enormous cost overruns (and) delayed delivery and repair rates” and unspecified traditions that were stifling innovation.

“Admiral Caudle, together we must rebuild, reform and refocus on what matters — readiness, accountability and results — in order to execute President Trump’s mandate of peace through strength,” Phelan said.

Caudle was unequivocal in his agreement with the often-repeated Trump administration phrase, saying, “Peace through strength works.”

The admiral, who until the promotion was commanding U.S. Fleet Forces Command, said he wanted to be “judged by the results we achieved.”

Specifically, he cited the number of ships delivered and repaired on time, the number of ships that are fully manned, and ordinance production as meeting the Navy's demands.

Phelan said Caudle's success “is inextricably linked to my success as secretary of the Navy and vice versa.”