WASHINGTON (AP) — President Donald Trump plans to pay his respects to two U.S. service members who were killed in a helicopter crash in Afghanistan this week.

Trump is traveling to Dover Air Force Base in Delaware for Thursday’s return of the fallen Army officers’ remains.

Trump has described these ceremonies as some of the toughest things he has to do as commander in chief of the U.S. armed services.

Chief Warrant Officer 2s David C. Knadle, a 33-year-old from Tarrant, Texas, and Kirk T. Fuchigami Jr., a 25-year-old from Keaau, Hawaii, died Wednesday when their helicopter crashed as they were providing security for troops on the ground in eastern Logar Province.

Both were assigned to a unit at Fort Hood, Texas.

The helicopter crash is under investigation.