What unit is the UIC W6NFRE?

Its the Maneuver Center of Excellence Replacement Detachment Enlisted, so I am guessing it is where you go for in-processing before being placed at a specific unit. I found the UIC list on AKO classic. I will post the instructions below:

Go to AKO. Type "UIC" and search for AKO Content. When the results show up, click "Knowledge Centers" on the left column. When the results show up, click "OSMIS UIC Files." From the list of files, click the most current Excel file. Open or save the document. When the file opens, sort Column G LONG_UNIT_DESC A to Z. Find your unit and read the Column A UIC.

Just be aware, sometimes those UIC are for the in-processing unit that you will be assigned temporarily.

I can check it for you tomorrow, it is 20:34 in Italy .