Ohio Department of Natural Resources - https://ohiodnr.gov/discover-and-learn/education-training/scouts/boy-scouts/eagle-scout-ltr
Smithsonian Institute - info@si.edu
United States Department of Defense (aka Department of War) - https://www.war.gov/Contact/Help-Center/Article/Article/2762743/scout-certificate-request/ (takes at least 2 months to process)
United States Geological Survey (USGS) - Kim Dueling (2 months advance notice required)