Thank you for your messages.
Keep in mind that although there were nearly 145,000 men who served in the Navy Armed Guard, many or most of them are no longer with us. Of those who are still living, a sizeable number probably do not have the knowledge, skill or interest in searching for information about the Armed Guard on the internet, or even know of this website. The odds that anyone reading your message would have known your father are actually quite slim. But you never know.
The list of Armed Guard personnel on this website is in no way a comprehensive list. The list is only of men (or sometimes their widows) who have become members of the U.S.N. Armed Guard World War II Veterans Association sometime in the last 20 years or so. If your father was not a member of the Association, he is probably not found on the Armed Guard website.
If you do not have other records pertaining to your father, you may be able to obtain his full service record from the National Archives. Please see this page on the Armed Guard website for information on obtaining service records: http://armed-guard.com/searchmil.html. His full service record should show the ships to which he was assigned, plus other significant information about his service. Note that the one ship you identify was probably named the Stephen Vincent Benet, not Bennett as you have it.
If you are able to identify the ships to which he was assigned and the applicable dates from his full service record, you may be able to obtain additional information on each ship, again from the National Archives. The web page identified above has information on other records maintained by the Archives that may be of interest, such as Armed Guard officers' reports.
Finally, you give your father's first name as Jack or Jackie. Was either name his formal given name? Or was his given name John? I have found the record of a John P. Potter, Jr., an Armed Guard seaman first class, arriving in New York City on September 2, 1944, from London, aboard a ship named A. Frank Lever. (This information comes from a search of www.ancestry.com; information about subscriptions to Ancestry.com is available on the same web page noted above.) If this is your father, I can supply a list of the other 30 Armed Guard sailors on that voyage, although I would not know whether any of them are still living, nor would I have contact information on any of them.
Ron Carlson, Webmaster
Armed Guard website www.armed-guard.com