ay immediately referred questions about the plans for the livestreamed execution to the Pentagon.

However, experts on military law said Hasan could choose to resist execution and file a habeas petition in civilian court, which could significantly delay the execution.

 It frankly might outlast the current administration, and who knows if the next one will have the same penchant for executions,  Eugene R. Fidell, a visiting lecturer at Yale Law School specializing in military law.

Hasan, an Army psychiatrist who held the rank of major, walked into a medical building where soldiers were were waiting in long lines to receive immunizations and medical clearance for deployment. He shouted  Allahu akbar  - Arabic for  God is great!  - and opened fire with a laser-sighted handgun.

During the trial it was revealed that Hasan spent weeks planning the deadly attack, and his preparation included videotaping a sales clerk showing him how to change the magazine on the pistol that he purchased. He would later go to a gun range outside Austin and ask for advice on how to reload with speed and precision from an instructor.

Soldiers later testified that Hasan's rapid reloading made it all but impossible to stop the shooting. Investigators recovered 146 shell casings inside the building and dozens more outside, where Hasan shot at the backs of soldiers fleeing toward the parking lot.

Hasan said it was an effort to stop them from going to Afghanistan and killing his fellow Muslims. A military judge barred him from presenting that as a defense during his trial. Hasan made almost no effort to defend himself in court, telling jurors when he acted as his own counsel that evidence would show he was the shooter and describing himself as a soldier who had  switched sides. 

Hegseth said the military hasn't executed a servicemember by firing squad since World War II. The last military execution took place on April 13, 1961, when Army Pvt. John Bennett was executed by hanging.