Thanks for the post about the Yorktown. I which I knew what ship my dad was on......there must be something around here that will tell me that.
You might check with US Navy BUPERS if you don't have access to his discharge papers. A copy of his DD214 should have his duty stations listed on it if that is available. A fire in St. Louis destroyed a lot of old records back in the 70's but some records are available.
Another option if you do not have access to your father's discharge papers or DD214 would be to locate some of his former shipmates who might be able to give you the information you wanted. Most of the veteran organizations (Fleet Reserve Association, American Legion, VFW, etc.) have a section in their monthly magazines for such a purpose.
See the following link for information on locating active duty, retired, or former naval personnel: Navy Locator
If you would like some help, I'll be glad to assist you via FReep-mail.