Here is a short story in English of the Decima activities in WWII:
http://www.comandosupremo.com/Decima.html
This is in Italian, very good info but no much in pictures:
http://www.decima-mas.net/frames2.htm
The Xmas also had subs in their division, not only frogmen's.
http://www.subnetitalia.it/decimaambra.htm
The Decima was the first operational Navy Seals in the world.
Technically the XMas was never disbanded more than a few months, they just got renamed after Mussolini died.
I have here an Italian propaganda video of this very division, technically the XMas of today:
http://www.nettouring.com/images/pub...Italiana_6.avi