Evan McAllister was 23 years old when he fought in the Iraqi city of Ramadi in 2006. He killed men and buried friends. Eight years later, he watched the same city fall to the Islamic State.

To McAllister, a former Marine staff sergeant and scout sniper instructor, the war he fought was a harebrained mission planned by Republicans, rubber-stamped by Democrats and, in the end, lost to al-Qaeda’s brutal successor. The foreign policy establishment of both parties got his friends killed for no reason, he said, so come Election Day, he is voting for the man he believes answers to neither Democrats nor Republicans: Donald Trump.

“Most veterans . . . they see their country lost to the corrupt,” he said. “And Trump comes along all of a sudden and calls out the corrupt on both sides of the aisle.”