US President Donald Trump on Wednesday will attend a ceremony for four US service members killed in Iranian attacks in the Middle East, who will return to American soil in flag-draped caskets, Reuters reports.

The US president will travel to Dover Air Force Base in Delaware for the ceremony, known as a “dignified transfer” of the bodies.

The war has cost US taxpayers at least $37.5 billion so far, has led to the deaths of 18 US service members and injured more than 450 troops. It has killed thousands of Iranians.