Two unsupported legs bookend the race
The 33.3 course structure creates two notable gaps: the first 5.8 miles to AS1 and the final 5.8 miles from AS1 (mile 28.2) back to the finish have no aid access. AS2 sits at mile 10.9 and again at mile 25.5, and AS3 sits at mile 18.4 with drop bags available there and at AS1. This layout is why the organizers require every 33.3 and half marathon runner to carry at least 2 liters of fluid.