Maj. Kristopher Williams, Kill Chain Integration Branch chief, shows off the sponsor signatures on his Boston Marathon jersey while on a run outside Hanscom Air Force Base, Mass., Sept. 8. Williams will participate in the Oct. 11 race as part of the Boston Children’s Hospital marathon team, and will represent two child patients, Patrick, 15, from Burlington, Mass., and Hunter, 6, a Hanscom resident. (U.S. Air Force photo by Lauren Russell)