US President Donald Trump will travel to Dover Air Force Base on Wednesday to attend the dignified transfer of four American service members killed in incidents linked to the war with Iran. Their flag-draped caskets will return to American soil as the conflict’s military, financial and political costs continue to rise.

First Lt. Tyler James Feehan, 25, Sgt. Angel S. Rampersad, 28, and Pvt. Isabella Gonzales, 19, were killed or believed killed after Iranian missiles and drones struck living quarters at Muwaffaq Salti Air Base in Jordan on Friday. All three served in US Army air-defense units.

Sgt. Michael Emmanuel Swinton, 30, was killed Sunday during the controlled detonation of a downed Iranian attack drone at Erbil Air Base in Iraq. The Pentagon classified Swinton as killed in action, although the circumstances of the incident remain under investigation. Another service member suffered minor injuries.

The war has now killed 18 US service members and injured more than 450 troops. Defense Secretary Pete Hegseth told lawmakers this week that the conflict has cost at least $37.5 billion, a figure that includes some anticipated expenses through the end of September. The Pentagon separately said that 100 service members had been injured since July 7 and that 96% had already returned to duty.

Pressure on the administration is growing as lawmakers from both parties question the war’s objectives and duration. A Reuters/Ipsos poll found that 79% of Americans expect the conflict to continue for an extended period, while only 37% approve of the US strikes. Rising oil and gasoline prices have also increased concerns among Republican strategists ahead of November’s midterm elections.