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"These are men and women who have made the selfless and courageous decision to risk and at times give their lives to protect the rest of us on a daily basis," Obama said when he delivered speech at the closing ceremony of the tribal nations conference.
One of the gunmen that killed 11 people and wounded 31 others in a mass shooting Thursday in a military base in Texas, the Untied States, has been identified as Major Malik Hassan, aged 39 or 40, the CNN reported.
A military psychiatrist, who opened fire at the U.S. Fort Hood Army base Thursday, killing 12 people and wounding another 31, was still alive, Army officials said.
His name appears on radical Internet postings. A fellow officer says he fought his deployment to Iraq and argued with soldiers who supported US wars. He required counseling as a medical student because of problems with patients.