National Park Service photo, Tim Ervin.

I was a little nervous when I saw on Tuesday that only 38 Facebookers said they’d attend, but the National Park Service managed to round up 1,200 people to create a living version of its emblem this morning.

Operation Arrowhead, as I’ve decided to call it, took place on the Washington Monument grounds. Participants included present and former NPS employees, volunteers, partners, and visitors, according to the park service.

This event was among several activities taking place locally throughout the month to celebrate NPS’ centennial including mini golf at Hains Point, lattes at the Lincoln Memorial, and a scavenger hunt inside a few Smithsonian museums. You can also gawk at the ridiculously good looking parks around the country.

This morning, participants formed NPS’ emblem and the number 100 using brown, white, and orange umbrellas, which they got to keep. And there were apparently enough folks there that some were randomly scattered around, too.

This marks the world’s largest Arrowhead created on the monument’s grounds, according to NPS. They plan to submit it to Guinness World Records for certification as an official record (the current record, according to NPS, is 323 participants).