Providing safety and security for an event of this size was a top priority for Marine Corps Marathon organizers as well as the event’s law enforcement partners. A Crowded AirspaceThe Washington, D.C., metropolitan area is served by three major international airports: Ronald Reagan Washington National Airport (DCA), Washington Dulles International Airport (IAD), and Baltimore/Washington Thurgood Marshall International Airport (BWI). So when the DroneSense Team was approached about assisting with drone operations for the Marine Corps Marathon, we responded by sending some of our best and brightest. One air boss was identified, coordinating all take-offs, landings and flight operations, essentially becoming the air traffic controller for all drone operations. In ConclusionThe 2022 Marine Corps Marathon began at 7:55 am, with a Howitzer sounding the official start of the race.