It's obvious that some of the greatest dangers to Airmen serving in a war zone are insurgents, roadside bombs, mortars, rocket-propelled grenades and bullets.

But what crawls around beneath their feet, sneaks into their lungs or worms its way into their minds may be just as lethal.

It's no secret that Airmen in good physical shape perform better in combat, said Lt. Col. Michael Butel, U.S. Air Forces Central chief of aerospace medicine and public health.

And the overall health of Airmen in war zones is good, he said. But these warriors are still susceptible to dangerous bug bites, respiratory illnesses and high psychological stresses.

"Overall, 99 percent of ...

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