Here's a couple of websites to help you start your search. The first is the official US Navy Armed Guard Association website-
http://www.armed-guard.com/association.html

the Esso Baltimore page-
http://www.armed-guard.com/esbalt.html


How to get medals for naval Armed Guard Service-
http://www.history.navy.mil/faqs/faq19-1.htm

Naval Armed Guard Records-
http://www.history.navy.mil/faqs/faq104-8.htm

Here's apage on the SS Maurice Tracy, rammed and sunk by the Billingsley in June 1944-
http://www.wrecksite.eu/wreck.aspx?19911

Hope this gives you a place to start