From the record
“The Hawthorne USO Building, at 950 E St. in Hawthorne, Nevada, was built in 1941 as a World War II United Services Organization (USO) social hall. It is a simple 90-by-160-foot "modified I plan" standard "USO Type D Federal Recreation Building", on Hawthorne's main street.”
Wikipedia article Hawthorne USO Building, CC BY-SA 4.0.
One of 4 National Register listings published here for Mineral County · listed in 2005 · category: Building · built in 1941.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

