The Marine Corps Marathon is a large point-to-point from Arlington through DC and back. Spectators should pick 1-2 spots rather than chasing the full course.
Best places to stand
Crystal City early for a first look. Near the Iwo Jima Memorial for mid-race energy. Finish area near the Pentagon / Arlington for the end.
Transit
Metro is essential. Many roads close. Post-race reunion takes time due to the secure zone.