Question: The One-Million-Liter Test Sphere — also known as the Test Sphere, the Horton Test Sphere, the Cloud Study Chamber, Building 527, and the “Eight Ball” (or “8-ball”) — is a decommissioned biological warfare (BW) chamber and testing facility located on which United States Army Medical Command installation located in Frederick, Maryland?
Sentence (from "One-Million-Liter Test Sphere"): It is the largest aerobiology chamber ever constructed and was placed on the National Register of Historic Places in 1977.
Relevant evidence: No