if the cocker was kc registered he might be listed in the BRS lots of army personel owned and bred working breeds. The owners were listed in the registrations so it would only take a bit of digging around the correct period. However alot of dogs remained unregistered around then.
WWII for all its horrors helped to introduce alot of foreign bred hunting dogs to the UK and the States, it seems alot of the army staff would buy them in and send them home. The Weimaraner certainly came in this way, army captains saw the dogs working and then tried to procure them with enough breeding stock to start their own lines back home, they were swapped for money, food, saftey and car parts alot of the time. Before that getting any of the local breeds out of places like germany was impossible the owners just wouldn't let them go to foreigners.
You can try this one as well, Always Faithful, A Memoir of the Marine Dogs of WW II (
http://www.amazon.com/Always-Faithful-Memoir-Marine-Dogs/dp/0743201981) they have a statue at Quantico of a dobermann to commemorate the war dogs used by the american army.
There is a good write up on the book here:
http://worldwar2history.info/Marines/dogs.htmlThere is another story on another website about a little black cocker who saved part of her squadron the article originally reported in the Daily Record newspaper in 1944
http://www.dogsinthenews.com/issues/0204/articles/020418a.htm This site has more info about dogs of war and some lovely photos.
http://www.vetmed.ucdavis.edu/CCAB/war.html