The 3rd Ordnance Battalion (unofficially referred to as the 3rd Explosive Ordnance Battalion) is a unit of the United States Army currently stationed at Joint Base Lewis–McChord. It is assigned to the 71st Ordnance Group at Fort Carson, Colorado, which is under the 20th Chemical, Biological, Radiological, Nuclear, and Explosive (CBRNE) Command, Aberdeen Proving Grounds, Maryland.