UPDATE, 2:05 p.m.: President Barack Obama began speaking at the memorial.
"It is love, tested by tragedy, that brings us together again," he said.
He praised the dedication to the Army of the three soldiers who were shot and killed in the April 2, attack.
"We must honor their lives," Obama said.
"We can do more to help those with mental health issues" and keep weapons out of the hands of those dealing with such difficult problems.
UPDATE, 1:49 p.m.: Lt. Gen. Mark A. Milley, the III Corps and Fort Hood commander, began today's Fort Hood shooting memorial by saying several of those who were shot in the attack displayed acts of bravery during shooting.
Milley spoke Wednesday of the life accomplishments of the three slain soldiers and their families as their president and uniformed comrades listened. Milley said they would always be remembered by their comrades and their families would always be cared for.
Besides the president, Lt. Gov. David Dewhurst, U.S. House Minority Leader Nancy Pelosi and U.S. Sen. Ted Cruz attended the ceremony.
Army Chief of Staff Gen. Raymond Odierno, speaking in front of III Corps Headquarters, said "the loss of any soldier is a tragedy to a unit or a family."
Referring to the Nov. 5, 2009, shooting at Fort Hood, Odierno said last Wednesday's shooting has opened the "wounds of five years ago."
UPDATE, 1:10 p.m.: Yet another soldier wounded in the April 2 shooting at is out of the hospital.
Fort Hood officials made the announcement as crowds gathered at a memorial ceremony for the those injured and killed in the attack.
The soldier, who was not named, has returned to duty along with 12 others who were also wounded in last week's shooting.
Of the four remaining wounded soldiers, two are recovering at Carl R. Darnall Army Medical Center on Fort Hood. Two others are currently at Scott & White Hospital in Temple.
All four are in stable condition, officials said.
White House officials said the president and the first lady set aside about two hours to meet with the families of the victims and those wounded in the shooting.
UPDATE, 12:15 p.m.: The President's motorcade arrived at Fort Hood's III Corps. Headquarters just before noon.
A smattering of onlookers gathered along the route to greet the motorcade as it traveled. Some waved, while others saluted.
On its way to the ceremony, the president's motorcade passed thorough the area where the April 2 shooting occurred.
There were flowers placed near some of the buildings, which including Fort Hood's 49th Transportation Battalion Headquarters, where Spc. Ivan Lopez began shooting at his fellow soldiers last week. When the smoke cleared, Lopez had fired 35 rounds of ammunition both inside and outside multiple buildings.
Investigators said the shooting created a crime scene the size of two city blocks. Those buildings have since been released back to Fort Hood.
FORT HOOD — President Barack Obama and First Lady Michelle Obama arrived at Robert Gray Army Airfield just after 11:30 a.m. this morning.
They were met by Fort Hood's commander Lt. Gen. Mark A. Milley, his wife Hollyanne Milley, and Rep. John Carter, R-Round Rock.
The president is expected to speak at a 2 p.m. memorial ceremony for the victims of the April 2 shooting that left four dead and 16 wounded.