To commemorate the 70th anniversary of the defence against the attack on Pearl Harbor, Hawaii; Ancestry are offering their entire collection of 58 million World War II military records for free access until midnight ET on 7th December (which I think means 5am GMT on 8th December).
You can search and get a skeleton overview for nothing, but to get the details you'll need to register for (or sign in with) a free account.
It doesn't say so, however their records seem only to relate to people that lived in America or who were in the United States forces. This does include Scots born here, so it may still be worth while searching. There's an illustrated PDF research guide available for download.