Greg Baxter joined the U.S. Marshals Service in 2006. He previously had worked security details in the State Department and the Supreme Court, and guarded U.S. Supreme Court Justice Anthony Kennedy after the terrorist attack on September 11, 2001. Baxter, 50, lives in Herndon, Va.

On September 16, 2013, Baxter was one of the first responders with a team of federal agents at the Washington Navy Yard after civilian contractor Aaron Alexis murdered 12 people in an office building. It changed his life.