Back in the 80s the US Naval Surface Warfare Center (NSWC) procured SIG Sauer P226 pistols for the SEALs. The NSWC version of the P226 was later sold to the public as the SIG P226 Navy. Unbeknown to me, the Navy has recently given the latest version of their P226 the designation Mk25 and SIG is now selling the Mk25 to public.

As far as I can tell, the only differences between the P226 Navy and P226 Mk25 is the inclusion of SIGLITE Night Sights.