WASHINGTON– The US military’s official death count in the Iran war has risen to 14 service members, with the death of a Navy pilot in a helicopter crash in early July in the Arabian Sea.

The number of soldiers injured in the conflict also rose to more than 400 as of Monday. Capt. Tim Hawkins, a spokesman for U.S. Central Command, said most of them suffered traumatic brain injuries.

The Navy initially described the July 1 accident as an emergency landing and said there was “no indication that the emergency was caused by hostile action.” The three remaining sailors aboard the helicopter were rescued shortly after the mishap.

The Pentagon’s war casualty count added one non-hostile death in July. It is the first death recorded since 13 service members died in separate incidents in March at the start of the war.

The first was an Iranian drone attack on a command center in Kuwait that killed six soldiers. Then a soldier died more than a week after initially being wounded in an attack on Prince Sultan Air Base in Saudi Arabia. Six more service members were killed when a KC-135 refueling plane supporting US military operations against Iran crashed in Iraq.

A total of 414 service members were injured, including one U.S. Air Force member added Monday. While Iran and the United States have resumed attacks, it is unclear if that is what caused the airman’s injury.

U.S. Central Command did not offer any details about the specific airman. But the traumatic brain injuries that have defined most injuries in war are an increasingly persistent problem among combat forces, especially those subjected to missile attacks and explosions that impact nearby.

While the injury, along with post-traumatic stress disorder, has become one of the signature injuries among veterans of the post-9/11 era, the impact on troops, especially in the long term, is still not well understood.

Asked Monday for the latest numbers of seriously wounded troops, Maj. Emma Thompson, a spokeswoman for U.S. Central Command, said she had no update and reiterated that “almost all” of the wounded have returned to duty. He also did not say how many service members have been injured enough to require evacuation from the region.