I just noticed today that the ABMC database (
https://www.abmc.gov/database-search) is no more displaying the unit of listed war dead, only the service (Army, Air Force, Marines, Navy, ...).
There is no more the choice to search per unit, and when you display of list of casualties using other criteria the unit is no more displayed.
It was last month, and had been for more than 20 years IIRC. I have to say that I don't see a reason to no more display an information that was available for a good part of the database (but not for the US Navy and the Marines).