The Pentagon said Friday that 34 U.S. troops were diagnosed with traumatic brain injuries suffered in this month’s Iranian missile strike on an Iraqi air base, and that half of the troops have returned to their military duties. Seventeen of the 34 are still under medical observation, according to Jonathan Hoffman, the chief Pentagon spokesman. President Donald Trump had initially said he was told that no troops had been injured in the Jan. 8 strike. The military said symptoms were not immediately reported after the strike and in some cases became known days later. It was at least the third time U.S. officials have had to revise President Trump’s Jan. 8 claim that no Americans were injured by the Iranian missile barrage. Nine service members remain in Germany and are undergoing evaluations and treatment. On Wednesday, Trump appeared to play down the injuries, saying he “heard that they had headaches and a couple of other things”. The one American sent to Kuwait has since returned to duty. All 16 of those who were diagnosed with TBI and remained in Iraq have since returned to duty, Hoffman said. No one was killed in the attack on Ain al-Asad. The strike was launched in retaliation for a U.S. drone missile strike that killed Qassem Soleimani, the most powerful military general in Iran, on Jan. 3 at Baghdad International Airport. Pentagon officials have said there had been no effort to minimise or delay information on concussive injuries, but its handling of the injuries following Tehran’s attack has renewed questions over the US military’s policy regarding how it deals with suspected brain injuries.