Hundreds of United States military veterans vow to defend the Standing Rock protest camp and march through a winter blizzard to the scene of recent clashes with state police and the national guard just outside of the Lakota Sioux reservation of Standing Rock, North Dakota, December 5, 2016.

The controversial Dakota Access pipeline will receive a permit from the U.S. Army Corps of Engineers to allow construction of the $3.7 billion project to be completed, according to North Dakota Senator Heidi Heitkamp.

The pipeline at the center of months of protests that has galvanized Native Americans and environmental activists. It would carry oil from North Dakota, through South Dakota and Iowa to be shipped out of Illinois.