WASHINGTON — It’s been described as the greatest burden any commander in chief must bear.

Just days into his young presidency, a U.S. service member has died in military action authorized by Donald Trump. It’s the first known combat death of a member of the U.S. military since Trump took the oath of office on Jan. 20 and underscores the gravity of the decisions he now makes.

Three service members were also wounded Sunday during the firefight with militants from al-Qaida in the Arabian Peninsula’s branch in Yemen. The raid left nearly 30 others dead, including an estimated 14 militants. A fourth U.S. service member was injured when a military aircraft assisting in the mission had a “hard landing” nearby, according to U.S. Central Command.

“Americans are saddened this morning with news that a life of a heroic service member has been taken in our fight against the evil of radical Islamic terrorism,” Trump said in a statement.

“My deepest thoughts and humblest prayers are with the family of this fallen service member,” he said.