WASHINGTON — The Military common who has led battle crimes prosecutions at Guantánamo Bay, Cuba, for a decade is retiring and handing off the trial of the 5 males accused of conspiring within the assaults of Sept. 11, 2001 to an as-yet unchosen successor.

Brig. Gen. Mark S. Martins of the Military served as chief prosecutor for navy commissions all through the Obama and Trump administrations.

His determination to step down got here as a shock as a result of he had obtained an extension to serve within the publish till Jan. 1, 2023. As an alternative, he’ll retire on Sept. 30, in response to a discover despatched by Karen V. Loftus, a prosecution employees member, to households of the almost 3,000 folks killed within the Sept. 11 assaults.

Normal Martins, a Harvard Regulation College-educated West Level graduate, had for a few years served as the general public face of navy commissions. In his first years within the place, he undertook a talking marketing campaign to advertise the hybrid type of justice that the Bush administration established after the invasion of Afghanistan.

The Obama administration made some modifications to the system and determined to pursue the Sept. 11 case in opposition to Khalid Shaikh Mohammed and 4 accused accomplices at Guantánamo, relatively than in federal court docket. A death-penalty case, it has been mired in pretrial proceedings since arraignment in Might 2011 as the edges deal with questions associated to the torture of the defendants in C.I.A. prisons earlier than their 2006 transfers to Guantánamo Bay, amongst different points.

Though the case at the moment has no navy choose assigned to listen to it, Pentagon officers are making ready for its first hearings since February 2020 to happen within the first two weeks of September, coinciding with the twentieth anniversary of the assault.

Normal Martins submitted his retirement papers on Wednesday after repeatedly butting heads with Biden administration legal professionals over positions his workplace had taken on the relevant worldwide regulation and the Conference Towards Torture on the Guantánamo court docket, in response to senior authorities officers with data of the disputes. Normal Martins didn’t reply to a request for remark.

A key level of rivalry was a latest determination by Normal Martins to make use of an announcement {that a} man accused of orchestrating the united statesS. Cole bombing in 2000 had made to the C.I.A. while being tortured to make a degree with the navy choose presiding in that case, which can be a death-penalty prosecution. Protection legal professionals for the prisoner, Abd al-Rahim al-Nashiri of Saudi Arabia, are interesting the admissibility of that proof.

On the identical day Normal Martins selected to retire, he filed a short asking the U.S. Court docket of Navy Fee Evaluation for additional time to answer the enchantment.

“Was he requested to resign or did he give up in protest?,” mentioned Navy Capt. Brian L. Mizer, Mr. Nashiri’s lead navy protection lawyer. “I don’t know.”

Ms. Loftus mentioned Normal Martins selected to retire “in the perfect pursuits of the continued instances.” Navy Commissions hearings are scheduled to renew subsequent week for the primary time for the reason that starting of the pandemic, in a case accusing an Iraqi man of commanding forces that dedicated battle crimes in Afghanistan in 2003 and 2004.

Ms. Loftus known as the timing “a really perfect window to determine a successor” as a result of proceedings are “lastly in view once more for all of our instances following the pandemic-driven hiatus.”

Normal Martins reduce a powerful determine in court docket at 6 toes 3 inches tall and a chest filled with medals on his blue Military uniform. A former Rhodes scholar, he had made assembly with and briefing the households of the victims a key a part of his duties, and had developed ties with a few of them by means of social alternatives at Guantánamo Bay. He had repeatedly obtained extensions on the project in his effort to see the Sept. 11 case to trial.

“My first thought is that the one continuity left is the defendants and the members of the family,” mentioned Joel Shapiro, whose spouse Sareve Dukat was killed on the World Commerce Middle and who has since labored as a information on the 9/11 Memorial & Museum in New York. “Nearly everybody else who has been concerned on this case has taken the chance to get on with their lives.”

“I used to be shocked that Mark is stepping down,” mentioned Adele Welty, whose firefighter son Timothy was killed on 9/11. “I believed he was very dedicated to seeing it by means of. However who can blame him? All the enterprise in Guantánamo is sort of comical in its ridiculous turns of occasions — choose after choose quitting, and now Normal Martins.”

The chief protection counsel, Brig. Gen. John G. Baker of the Marines, is leaving his publish on Nov. 1. The method of changing him with a brand new navy lawyer with a one-star rank — to offer him parity with Normal Martins — was already underway, with a possible candidate chosen.

Protection officers mentioned a board was prone to be assembled to pick a brand new chief prosecutor, who will be the rank equal of an Military colonel relatively than the rank of a one-star common. Within the interim, Ms. Loftus mentioned, Normal Martins’s civilian deputy, Michael J. O’Sullivan, will serving as appearing chief protection counsel.