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Damage on Jan 13. sustained in Iran's attack of Ain al-Asad military air base, which houses U.S. troops in the western Iraqi province of Anbar. Photo: Ayman Henna/AFP via Getty Images

The Pentagon revised the number of U.S. service members diagnosed with traumatic brain injuries (TBI) following Iran's Jan 7. attack on U.S. bases in Iraq to 50 on Tuesday.

The big picture: This is the third time the Pentagon has updated the figures for those injured in the attack. Per the CDC, TBIs are not always detected immediately after they've been sustained.

This is a snapshot in time and numbers can change."
— Pentagon spokesperson Thomas Campbell

Flashback: On Jan. 17, the Defense Department said 11 troops were "evacuated from Iraq with concussion-like symptoms," AP notes.

What they're saying: 31 of the 50 service members injured were treated in Iraq and returned to duty, "including 15 of the additional service members who have been diagnosed since the previous report," Pentagon spokesperson Lt. Col. Thomas Campbell said in a statement.

"18 service members have been transported to Germany for further evaluation and treatment. This is an increase of one service member from the previous report. As previously reported, one service member had been transported to Kuwait and has since returned to duty."

Go deeper:

Go deeper

Inaugural address: Biden vows to be "a president for all Americans"

Moments after taking the oath of office, President Joe Biden sought to soothe a nation riven by political divisions and a global pandemic, while warning that "we have far to go" to heal the country and defeat a "virus that silently stalks the the country."

Why it matters: From the same steps that a pro-Trump mob launched an assault on Congress two weeks earlier, the new president paid deference to the endurance of American political institutions.

Updated 55 mins ago - Politics & Policy

Inauguration Day dashboard

U.S. Capitol and stage are lit at sunrise ahead of the inauguration of Joe Biden. Photo: Patrick Semansky - Pool/Getty Images

President Biden has delivered his inaugural address at the Capitol, calling for an end to the politics as total war but warning that "we have far to go" to heal the country.

What's next: Biden and Vice President Harris review readiness of military troops, a long-standing tradition to signify the peaceful transfer of power.

Updated 1 hour ago - Politics & Policy

In photos: The Biden and Harris inauguration

Joe Biden is sworn in as the 46th president of the United States. Photo: Alex Wong/Getty Images

Joe Biden and Kamala Harris were inaugurated as president and vice president respectively in a ceremony at the U.S. Capitol on Wednesday morning.

Why it matters: Top Democrats and Republicans gathered for the peaceful transfer of power only two weeks after an unprecedented siege on the building by Trump supporters to disrupt certification of Biden's victory. Trump did not attend Wednesday's ceremony.