Panamerican Consultants - A Commonwealth Heritage Group, Inc. Company is one of the nation’s largest cultural resource management firms, offering a full range of archaeological, architectural, historical, and geophysical services. Clients include eleven district offices of the U.S. Army Corps of Engineers, all branches of the U.S. Armed Forces, the National Park Service, Departments of Transportation in nine states, U.S. Department of Agriculture, and numerous engineering and environmental firms and major energy companies.