JACKSON, Wyo.—Dozens of U.S. fellow Marines joined hundreds of Wyoming residents to bid a final farewell at a memorial for Rylee McCollum, one of 13 U.S. servicemen killed in a suicide bombing as they guarded a gate at a chaotic Kabul, Afghanistan airport during the final U.S. evacuation from that country. Many of the Marines were members of the 20-year-old McCollum’s unit serving in Afghanistan when he was killed on Aug. 26. McCollum, a Marine lance corporal, grew up, went to school, and enlisted for the Corps in the mountain valley area known as Jackson Hole, home to the town of Jackson. He was honored during Saturday’s Jackson service attended by more than 400 people. “We knew his potential. I knew he had the mindset,” said Staff Sgt. Luis Diaz, who recruited McCollum into the Corps. “I knew he had the spirit to accomplish anything he wanted.” McCollum was a …