In 1973 a huge fire destroyed the bulk of WWII military personnel records housed at the National Archives' St. Louis, MO building. Their website states that the 1943 unit rosters survived, and morning reports for the war should be available. Sadly, my reply letter from the Archives said they had nothing for my grandfather's unit!
I've been researching my book on the 304th Port Co., 519th Port Bn. since 2006. Mostly I have been interviewing veterans from the unit (my grandfather included). I received an invaluable unit history from the US National Archives in College Park, MD. Thankfully, before the 1973 fire my friend Dave Weaver requested about 10 morning reports surrounding the D-Day invasion. I would have dearly loved to get more. I was also hoping to get a full roster of the men that served in the unit.
If by chance you have some of these records, please let me know!