The U.S. military’s official death toll in the war against Iran has risen to 14 service members following the loss of a Navy pilot in a helicopter crash in the Arabian Sea in early July. The number of wounded troops has also increased to over 400 as of Monday, with the majority suffering from traumatic brain injuries.

The incident involving the Navy pilot occurred on July 1. The Navy initially characterized the crash as an emergency landing, stating there was no indication that hostile action caused the mishap. Three other sailors aboard the helicopter were rescued shortly after.

This marks the first recorded death since March, when 13 service members died in separate incidents at the outset of the war. Those earlier fatalities included six soldiers killed in an Iranian drone strike on a command center in Kuwait, one soldier who died after being wounded in an attack on the Prince Sultan Air Base in Saudi Arabia, and six service members who perished when a KC-135 refueling aircraft crashed in Iraq.

An additional U.S. Air Force member was reported wounded on Monday, bringing the total to 414. Central Command spokesman Capt. Tim Hawkins noted that most of the wounded have returned to duty. However, it remains unclear if the recent injury to the Air Force member is connected to ongoing strikes between Iran and the U.S.

Traumatic brain injuries, often sustained from nearby missile strikes and explosions, have become a persistent issue for combat forces and are a signature wound for veterans of post-9/11 conflicts. The long-term effects of these injuries on troops are still not fully understood.