WASHINGTON — An independent panel reviewing the failures that led to the attempted assassination of former President Donald Trump in July called on the Secret Service to replace its leadership with people from the private sector and focus almost exclusively on its protective mission.

The recommendations, part of a report released Thursday and commissioned by the Department of Homeland Security, outlined deficiencies that had already been identified in the months after the rally in Butler, Pennsylvania, on July 13. Those include the failure of the Secret Service to secure a nearby building where a would-be assassin stationed on the rooftop fired eight shots toward Trump. That and other security lapses, members of the panel said, resulted from an absence of “critical thinking” among agents and supervisors.

The panel was particularly struck by a “lack of ownership” conveyed by the agents it interviewed. Those involved in the security planning did not take responsibility in the lead-up to the event, nor did they own failures in the aftermath.

The findings are stark — this is the first assessment to bluntly identify failures on the part of senior agents on Trump’s personal detail. Yet the conclusions are also familiar.

A panel convened in 2014 after a man scaled the White House fence and entered the mansion made similar proposals.

“The service has become insular and stale,” Janet Napolitano, a member of the four-person panel, said. Napolitano was secretary of the Department of Homeland Security, the Secret Service’s parent agency, from 2009 to 2013.

In the past century, the agency has had only one director not promoted from within.

The panel included Frances Fragos Townsend, a former homeland security adviser during the George W. Bush administration; David Mitchell, who has been in law enforcement for more than 50 years; and Mark Filip, a former deputy attorney general during the Bush administration. They conducted 58 interviews and reviewed more than 7,000 documents.

“The Secret Service must be the world’s leading governmental protective organization,” the report said. “The events at Butler on July 13 demonstrate that, currently, it is not.”

Should the service adopt the panel’s recommendation that it shift its focus almost entirely to protection operations, that would mean shedding much of its historic role in investigating financial crimes.

The acting director of the Secret Service, Ronald Rowe, said in a statement that the “fundamental transformation” already underway at the agency would include “our dual mission of protection and complex investigations.”

The Secret Service has bristled at previous suggestions that it stop investigating financial crimes. The agency was founded with that mission, and the presidential protection directive came later.

In a statement, Alejandro Mayorkas, homeland security secretary, said the department would consider all of the panel’s recommendations. As the department’s deputy secretary, Mayorkas conducted a review of the Secret Service in 2014 and identified issues similar to the lapses at the Butler rally.

The agency has already made significant changes since, including assigning additional personnel and assets to Trump’s detail and taking steps to ensure the security planning process for events is more thorough. Trump was targeted again Sept. 15 when a man with a rifle hid near where Trump was playing golf in Florida.

The independent review is one of several investigations begun after the July 13 assassination attempt. Lawmakers are conducting their own inquiries, and the Secret Service did an internal review.

Among the failures identified: the absence of a single Secret Service agent in charge of the security for the Butler rally, the complacency of some of the agents involved in securing the rally and the lack of clear instructions from the Secret Service to local officials who were helping them.

The panel listed instances in which the site agent tasked with organizing security at the Butler Farm Show grounds did not do a thorough job of ensuring key security was in place before the rally, in part because she was inexperienced. She graduated from the agency’s academy in 2020 and joined Trump’s detail in 2023.

The decision to give her this assignment, the panel said, appeared to be based on her availability “and without adequate consideration by supervisory personnel within the detail regarding the agent’s level of experience and associated aptitude and training, or lack thereof, for contributing to the planning of a major outdoor rally event like Butler.”

The panel also noted the lack of experience of another agent on Trump’s detail who was assigned to operate a drone detection system on the day of the rally. The agent, who joined the service four years ago, had received only informal training about how to use the system, and July 13 was just the third time he operated it at an event. The day of the rally, he faced significant technical challenges that he spent hours trying to resolve. As a result, the equipment was not operational when the gunman, Thomas Crooks, flew a drone over the rally site that afternoon.

The site agent from Trump’s detail is one of six agents to be placed on restricted duty since the July assassination attempt. The other five are from the service’s Pittsburgh field office. The agency’s director at the time, Kimberly Cheatle, has resigned.