More than 350 U.S. service members have been injured since military action against Iran began in late February.

And U.S. Central Command says the vast majority of those injuries are TBIs or traumatic brain injuries.

Our Liz Landers is here with more.

Traumatic brain injuries have become the defining injury of post-9-11 conflicts in Iraq, Afghanistan, and now in Iran.

And while many service members are able to return to duty, the symptoms of TBI can often linger for years or even a lifetime.

Joining us now is Jaina Mosseri Brooks, who has studied combat-related traumatic brain injuries for years.

She's a professor at NYU in the College of Nursing.

Jana, thank you so much for joining NewsHour.

Thanks for having me.

Why have traumatic brain injuries for soldiers become more common, not just in this war with Iran,

but also in the war on terror in the last 20 or so

years? I think there's a number of factors for that. One is that the type of warfare has changed,

where it moved to the urban environment, where service members were experiencing a lot more

IEDs and EFPs that caused the blast over pressure injury to their brains. Also, we have such

strong armor that I think previous service members would have not survived some of the blasts

that our current service members have survived. And they've walked away alive, but with

traumatic brain injuries from the blast. TBI is sometimes called an invisible wound.

What are some of the effects or symptoms of traumatic brain injuries?

So there's many wide-ranging effects, and they are somewhat individual to the person who

experienced it.

But common symptoms include headaches, ringing in the ears, visual changes,

sleep disturbances, impulse or memory challenges, difficulty concentrating. There's a range of

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