Army Specialized Training Unit 3921. [Army Specialized Training Unit 3921 Class "A" Pass, June 19, 1943], text, June 19, 1943; (https://texashistory.unt.edu/ark:/67531/metapth1679701/m1/1/: accessed June 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .