US President Barack Obama will attend a memorial service in Texas this week to honour victims of the shooting rampage on the military base in which 13 people died, the White House said on Saturday.
Investigators were meanwhile working around the clock to uncover the motives of the Muslim US army doctor suspected in the killings that also wounded 30 people.
Criminal investigators were poring over evidence to determine if the alleged shooter -- Major Nidal Malik Hasan, who survived shooting wounds and is under guard at a military hospital -- was motivated by Islamist ideology or had snapped under the pressure of his job counseling soldiers traumatized by combat.
In his weekly radio address on Saturday, Obama, ahead of the announcement of his traveling to the ceremony on Tuesday, called the mass-shooting "one of the most devastating ever committed on an American military base."
An initial search of Hasan's computer revealed no direct exchanges with known extremists, but US Army and FBI officials had yet to rule out possible links to terrorist groups, US media reported.
Earlier this year, the Federal Bureau of Investigation learned of Internet postings by a man calling himself Nidal Hasan that expressed support for suicide bombings.
Investigators were not able to determine yet whether the writer was Major Hasan, but the details fueled concerns that authorities may have missed warning signs prior to the attack at Fort Hood, Texas.
Neighbors reportedly said Hasan, 39, was in a rush when he gave away his belongings -- including a Koran -- shortly before Thursday's bloody shooting spree.
"I'm not going to need them," he told one neighbor, Patricia Villa, according to The New York Times, handing over bags of vegetables, a mattress and clothing.
A US-born Muslim of Palestinian heritage, Hasan had voiced dismay over US wars in Islamic countries and was distraught that he was about to be deployed to Afghanistan.
He reportedly said the US struggle against terror threats was a "war on Muslims," while his family alleged he was the target of prejudice and harassment over his Islamic faith.
Poignant details released here Saturday of each of those killed in the rampage drove home the scale of the tragedy.
The victims included a 21-year-old mother-to-be Private Francheska Velez, who was due to return home to Chicago for maternity leave after a tour in Iraq, and 56-year-old John Gaffaney, a psychiatric nurse who had just persuaded the military to let him return to active duty for deployment in Iraq.
Private First Class Kham Xiong, 23, was a father of three whose own father had fought communist forces in Laos during the Vietnam war.
Specialist Ryan Hill, 28, came to the base with his young daughter Emma to put flowers and candles at the main gates as a mark of respect to the victims.
"It makes me mad. I don't how somebody can commit an act like that," Hill told AFP. "Those soldiers were ready to take off and deploy and they won't even get to do that."
The bodies of those killed were taken on Friday to the same mortuary at Dover Air Base in Delaware that handles fallen soldiers from the wars in Afghanistan and Iraq.
But at least some of those shot were making a good recovery, according to Roy Smythe, a surgeon at the Scott and White Hospital in Temple, Texas.
"We had initially six patients in the surgical intensive care unit, as of this morning we only have two left," he said. "Those are no longer on the ventilator and they're quite stable so a lot of progress has been made.
"There is a possibility that some of these patients will be physically impaired for the rest of their lives and there is certainly no doubt that many of them will be psychologically impaired for the rest of their lives."
Obama in his radio address hailed the response of soldiers and civilians at the scene who rushed to help victims, tearing off bullet-riddled clothes to treat the injured and using blouses as tourniquets.
The president ordered flags to fly at half-staff at the White House and federal buildings, as troops at home and abroad held a minute's silence to mourn the dead.
Hasan was shot and seriously wounded by a female civilian police officer who was being hailed as a heroine for ending his deadly rampage.
Witnesses reportedly heard Hasan, who investigators believe fired more than 100 rounds during the incident, shout "Allahu Akbar!" (God is greatest) before unloading a semiautomatic weapon and a handgun at a troop processing center.
Troops based in Fort Hood, by area the world's largest US military base, have suffered the highest number of casualties and have undertaken multiple tours of duty in Iraq and Afghanistan.
The shooting has meanwhile raised delicate questions about Muslim soldiers serving in the military, as some commentators warned of an Islamic "fifth column" infiltrating the army while Islamic groups called for calm amid concerns of a backlash.