Coyle, currently chief of joint capabilities, will replace Lieutenant General Simon Stuart, the government said. Her appointment comes as the Australian Defence Force seeks to increase female representation and address allegations of systemic sexual harassment and discrimination.

Defence Minister Richard Marles described the move as a “deeply historic moment,” adding that Coyle’s leadership would be significant for women serving in the military and those considering enlistment.Coyle, 55, joined the army in 1987 and has held several senior command roles.

Marles said she would also become the first woman to lead any service branch within the ADF.Women currently account for about 21% of ADF personnel and 18.5% of senior leadership positions. The military has set a target of raising female participation to 25% by 2030.

The leadership changes come after a class action lawsuit filed in October alleged the ADF failed to protect thousands of female personnel from sexual assault, harassment and discrimination.

In parallel appointments, Vice Admiral Mark Hammond will become chief of the ADF, replacing Admiral David Johnston, while Rear Admiral Matthew Buckley will take over as head of the navy.

Speaking at the Reagan National Defense Forum in Simi Valley, he stressed that every military action must align with national security priorities and legal standards.

Hegseth said he stood by the original decision to neutralize the vessel due to intelligence indicating a significant drug-trafficking threat.

He emphasized that combating illegal narcotics remains a key priority for safeguarding American communities and strengthening regional stability.

He explained that he viewed the initial strike and then left to attend a scheduled meeting, underscoring that operational command remained in the hands of on-site military leadership.

The defense chief framed the issue as part of ongoing efforts to modernize command structures and strengthen real-time communication during maritime operations.

Officials from the administration later clarified that the additional action taken that day resulted from the field commander’s tactical assessment of potential narcotics remaining on the wreckage.

They noted that rapid decisions in dynamic maritime environments are driven by the need to prevent illicit substances from reaching criminal networks.

Hegseth reaffirmed that the matter is under internal review, including discussions about whether the full video of the operation will be released.

He highlighted the importance of responsible transparency, ensuring that sensitive material is handled in a way that reinforces public trust and protects military personnel.

The September 2 action was the first in a series of maritime counter-narcotics operations conducted across the southern Caribbean and eastern Pacific.

These missions form part of a broader strategic initiative to disrupt transnational criminal organizations that threaten regional security.

Officials cited the campaign as a significant effort to safeguard coastal communities, strengthen international cooperation and reduce the movement of illegal drugs into the United States.

They emphasized that maritime interdiction requires precision, discipline and close adherence to legal and ethical frameworks.

The imagery shown to lawmakers raised questions about the conduct of the second strike, prompting discussion about the standards set out in the Defense Department’s Law of War Manual.

The manual outlines clear protections for individuals who are incapacitated or shipwrecked and not engaged in hostilities.

Hegseth acknowledged the importance of these legal safeguards and said that reviews are an essential part of ensuring military actions remain aligned with U.S. values.

He stressed that the military’s credibility is strengthened when policies prioritize humanitarian principles alongside national defense.

Administration officials framed the broader anti-drug strategy as part of an international effort to curb dangerous cartels and protect civilian populations affected by illicit trafficking routes.

They highlighted ongoing diplomatic, intelligence and enforcement partnerships with regional governments aiming to improve maritime security.

The defense secretary noted that conversations with lawmakers and oversight bodies are a normal part of democratic governance.

He welcomed constructive dialogue as a way to refine operational protocols and support service members who carry out demanding missions.

Hegseth expressed appreciation for the men and women of the armed forces whose work forms a central part of national security.

He emphasized that their commitment to lawful conduct and operational excellence remains a cornerstone of U.S. defense policy.

As reviews continue, officials reaffirmed that the United States remains dedicated to transparency, accountability and strong cooperation with international partners in combating transnational threats.

They added that upcoming evaluations will help shape future operations to ensure they align with both strategic priorities and humanitarian obligations.