The U.S. Border Patrol agent who was struck with a Subway sandwich in Washington, D.C., in August testified on the incident in federal court on Tuesday. Gregory A. Lairmore, a 23-year veteran of the agency, said he was not injured by the sandwich toss, but said he could feel its impact through the ballistic vest he was wearing. It came apart and “kind of exploded” when it struck his chest, according to Lairmore. “I could smell the onions and mustard,” he said. Lairmore was called to the stand