The X-1 and the DA are the same thing with the same functions and modes, however the X-1 is the DOD version of the DA.
Both are made by BE Meyers.
If you are lucky enough to be issued a MAWL in the Military it will more than likely be an X-1, if you are really lucky it might be a MAWL-CLAD, but thats a story for another day children.