In fairness to Sig, in those tests, the slides that broke were rails coming off the slide. That was very common when hot ammo was used on the early P226s, and after very few rounds fired. I saw several broken P226 slide rails caused by Fiocchi Combat 123gr Truncated Cone ammo. I don't know of any P226 slides that broke and caused injuries, either in Military testing or on the Commercial market. The Beretta M9 slides broke right in front of the breech faces, allowing the back portions of the slides to fly back and whack the users in the face. There were some very senior NCOs who suffered life altering, and career ending wounds from being 'Beretta punched'. Imagine a razor sharp guardrail nut on the end of a piece of 550 cord being slammed into you face with a full swing. Ouch.Beretta won in court because the issued ammo in the tests by the SEALs was +p+ level power. They also broke 2 Sig 226 slides, but for some weird reason those never get mentioned. As soon as the slides broke the Army rushed out and proclaimed the M9 as junk and defamed Beretta when it turned out to be the fault of the government. At least 3 of the services have the M17/18 under review.
And the M9/92 Series of today are fantastic pistols.