The hashtag has been used to protest the Dakota Access pipeline project, a 1,172-mile pipeline that would transport about 470,000 barrels of oil from North Dakota to IL. The protests have largely been led by local Native American groups that allege the pipeline, if completed, will run through sacred lands and contaminate water supplies in the area.
Ironically, the state-named pillars that ring the World War II memorial are meant to "celebrate the unprecedented unity of the nation" during World War II, according to the monument's website. NPS monument preservation experts have already treated the graffiti with a light paint stripper, but more treatments will be needed to remove any trace of the spray paint.
"Park Service spokesman Mike Litterst says that some time before 10 a.m. Monday, someone spray-painted the phrase "#NoDAPL" on the North Dakota section of the memorial. Anyone with information should contact investigators at 202-610-7500.
"Applications will continue until the marking is no longer detectable", the Park Service said in a press release.