Tyler James Feehan found a way to live life to the fullest, but some of his greatest adventures awaited him on the other side of his deployment: getting married, graduating with an MBA and finishing law school, his family and university said.

Now, instead of upcoming nuptials, Feehan’s loved ones are making funeral arrangements for the 25-year-old – one of 18 US troops killed in connection with the war in Iran.

The first service member deaths in the war came on March 1, when six Army Reserve troops were killed in an Iranian strike on a makeshift operations center in Kuwait.

Days later, an Army sergeant died after sustaining injuries during an attack in Saudi Arabia and six more service members were killed when a US Air Force KC-135 Stratotanker refueling aircraft crashed in Iraq.

In March, President Donald Trump said meeting with some of the fallen soldiers’ families at the time did not give him pause about the war. He and senior officials made clear there would likely be more casualties. Indeed, the human cost of the conflict has climbed, with a wave of service member deaths in July.