In April 2013, the U.S. Army deployed a THAAD missile battery to Guam on an emergency basis in response to missile threats by North Korea. Since the temporary deployment of the THAAD battery in 2013, the Department of Defense validated the enduring requirement for a THAAD battery in Guam to ensure continued defense of the homeland against existing and emerging missile threats by potentially hostile states in the region, as mandated in Title 10 of the U.S.C., Armed Forces.
Prior to the emergency emplacement of the U.S. Army’s THAAD battery in April 2013, its
current location on Northwest Field (NWF) at Andersen Air Force Base served as a key asset for cargo parachute operations (airborne training). The current location of the THAAD battery forced airborne training activities and exercises to other locations in the region.
The Proposed Action for the THAAD EA is to maintain the THAAD battery permanently in Guam. The current battery has been operating as an expeditionary (temporary) mission at
Andersen AFB since its deployment in April 2013.
The THAAD EA analyzes two alternatives, and a No Action Alternative, to the Proposed
Action. Both alternatives include:
The Preferred Alternative also includes site improvements and operational changes made to the current THAAD battery, as well as expansion of the current cargo drop zone (CDZ) into adjacent areas on Northwest Field (NWF).
The Terminal High-Altitude Area Defense (THAAD) system is a transportable, rapidly deployable capability to intercept and destroy ballistic missiles inside or outside the atmosphere during their final, or terminal, phase of flight. See the Department of Defense’s website on the THAAD system for more information:
The National Environmental Policy Act (NEPA) of 1969 was enacted to address concerns about environmental quality. NEPA's main objectives are as follows:
NEPA requires a Federal agency to analyze impacts from a proposal and its alternatives, and provides the public with opportunities to participate in the process.
An environmental assessment (EA) is a public document that provides a structured approach to environmental impact analysis, as mandated by Council of Environmental Quality regulations for NEPA. An EA is a detailed public document describing a proposed action, all alternative actions that were considered, and the environmental impacts of implementing the Proposed Action and reasonable alternatives.
The Council of Environmental Quality was established to implement and oversee Federal policy in the NEPA process. The CEQ regulations specify that an EA be prepared to provide evidence and analysis for determining whether to prepare a Finding of No Significant Impact (FNSI) or to prepare an Environmental Impact Statement (EIS). The EA aids in an agency’s compliance with NEPA when an EIS is unnecessary and facilitates preparation of an EIS when one is required.
A Finding of No Significant Impact (FNSI) documents an agency’s decision after completion of an EA that the proposal would not result in significant impacts to the environment and that preparation of an EIS is not necessary.
Public comments are no longer being accepted on the EA and Draft FNSI. However, both documents continue to be available for reference on the "Documents" page of this website and at the following local
The updated THAAD EA was available for public review and comment from March 17, 2017 until April 17, 2017. The U.S. Army will incorporate public comments into the EA, as appropriate. The Final EA and signed FNSI were published on April 26, 2017 and can be reviewed on the "Documents" page of this website.
For further information or questions on the THAAD EA, please contact:
U.S. Army Space and Missile Defense Command/Army Forces Strategic Command
Attention: SMDC-ENE (Mark Hubbs)
PO Box 1500
Huntsville, AL 35807-3801