I found some information on this ship, indicating it had changed names a few times before being scrapped in 1939.
Built in 1886 named Cherokee; 1922 sold to Gulf & Southern SS Co., NY renamed Tampa, 1929 sold North American Fruit & SS Corp, NY renamed Western Wave, 1932 sold to J. A. Wilson, NY renamed Texan, 1939 scrapped. (Source: http://www.theshipslist.com/ships/lines/clydeline.htm
- scroll to vessel name "Cherokee (1)")
SS Western Wave was listed as Arrived, from Liverpool, in this article from the New York Times: http://query.nytimes.com/mem/archive-free/pdf?res=F60812F63A...
This is a link to a lawsuit in 1935, vs. the Port of New Orleans: http://22.214.171.124/leagle/xmlResult.aspx?xmldoc=193577277...
Most ships (when researching the Merchant Marine) were not commissioned by the US Navy, so Western Wave was probably called S.S. Western Wave, not USS. The S.S. (or s/s or stmr) usually refers to Steam Ship.
Best of luck in your research!