FORT HOOD (November 6, 2009)--A day of mourning was declared Friday at Fort Hood after an officer fired on soldiers in a deployment-processing area, killing 13 people and wounding 30 others.

Flags fly at half-staff throughout Central Texas and around the world in honor of the dead and injured.

Secretary of Defense Robert Gates declared a moment of silence for U.S. military forces worldwide as a show of respect for the Fort Hood victims at 1:34 p.m. Friday, exactly 24 hours after the shooting.

All U.S. forces worldwide are being asked to participate in the show of respect and Fort Hood is asking Central Texans to join the observance.

President Barack Obama Friday ordered U.S. flags lowered to half-staff through Nov. 11, which is Veteran’s Day.

“This is a modest tribute to those who lost their lives, even as many prepared to risk their lives for their country,” Mr. Obama said.

“We honor their service, we stand in awe of their sacrifice and we pray for the safety of those who fight and the families of those who have fallen,” he said.

Gov. Rick Perry ordered all Texas flags lowered to half-staff until Sunday.

In neighboring Arkansas, Gov. Mike Beebe ordered all U.S. and Arkansas flags to be flown at half-staff to honor those killed and wounded at Fort Hood.

The flags are to be lowered until sunset Friday.

Beebe said in a statement that military personnel in Arkansas have a long history with Fort Hood.

In Washington, the U.S. House will adopt a resolution honoring Fort Hood soldiers and their families in the wake of the shooting.

Rep. John Carter, R-Round Rock, whose district includes the sprawling military post, is the lead sponsor of the resolution, which Rep. Chet Edwards, D-Waco, will introduce as Carter returns to Central Texas.

The resolution says, “Honoring the lives of the brave soldiers and civilians of the United States Army who died or were wounded in the tragic attack of November 5, 2009 at Fort Hood, Texas. The American people share the pain and grief of this tragic loss. Our thoughts and prayers will continue to be with the families of those who were so unfortunately taken from them.”

In remarks on the House floor Friday, Edwards, whose district used to include Fort Hood, said, “In the days ahead, Ft. Hood will become known to the world as a place of unspeakable tragedy, but I know it as a place of great triumph—a place where service to country isn’t just an ideal, it is a way of life, a place where the American spirit is alive and well, even amidst this tragedy.

“I hope the world will see the Ft. Hood I saw as its representative in Congress for 14 years,” he said.

A moment of silence will be observed Saturday before the start of the Army-Air Force football game at the U.S. Air Force Academy in Colorado.

Academy spokesman Troy Garnhart said the observance will also honor soldiers from nearby Fort Carson who've been killed in Iraq and Afghanistan.

The academy and Fort Carson are on the outskirts of Colorado Springs. Saturday's game is at the academy's Falcon Stadium.

Fort Carson spokeswoman Brandy Gill said a pep rally for the Army football team is still planned Friday night at the post.

It's not yet clear how the Fort Hood tragedy will be recognized.

The dean of West Point's Academic Board and the deputy commander of Fort Carson's 4th Infantry Division are expected to speak at the rally.

President Barack Obama will attend a memorial service for those killed at Thursday's mass shooting at Fort Hood, White House spokesman Robert Gibbs said Friday.

Gibbs said a service would be scheduled at the convenience of the families who lost loved ones during one of the largest mass shooting on a military base.

Gibbs said a service has not yet been scheduled and said it would be planned around the families' schedules, not the president's.

Earlier, in remarks in the Rose Garden, Mr. Obama said the "whole nation is grieving right now" over the mass killings at Fort Hood.