The U. S. Army Garrison (USAG) Yuma Proving Ground (YPG) completed an environmental assessment (EA) for Extended Range Cannon Artillery (ERCA) in 2017 per the National Environmental Policy Act (NEPA). That EA analyzed the impacts of a multi-element, multi-phase test program of U.S. Army’s next generation 155mm artillery system that included test firing extended range munitions at distances up to approximately 73 km within the Kofa Region at YPG and the Barry M. Goldwater Range (BMGR), which is jointly administered by Marine Corps Air Station Yuma (MCASY) and Luke Air Force Base (LAFB). As development of this next generation of artillery has progressed, YPG now needs to fire greater distances and incorporate the use of guided and high explosive munitions that were not addressed in the 2017 ERCA EA. They have initiated a Supplemental EA to evaluate the potential effects that could result from: use of high explosive munitions; use of guided munitions; use of additional gun positions on BMGR West; and use of additional targets on BMGR East to accommodate employment of high explosive munitions.
