The 30-second spot, entitled “Stop Clinton, Vote Trump,” features Mark Geist, a Marine Corps veteran and security contractor who fought the assault on the U.S. mission in Benghazi, Libya, in 2012 that claimed four American lives, including Ambassador Chris Stevens.

“A lot of people say they’re not going to vote this November because their candidate didn’t win; Well, I know some people who won’t be voting this year either,” Geist says as he walks through a cemetery in the ad. “Hillary as President? No thanks. I served in Benghazi. My friends didn’t make it. They did their part. Do yours.”