Only 4 of them.
Can't Touch This: This Might Be the Ultimate Sig Sauer M17 Gun
When the Sig Sauer M17 was adopted by the U.S. Army, Sig Sauer, Inc. jumped on the opportunity to create commemorative versions of the pistol for the Army’s 3rd Infantry Regiment, “The Old Guard,” which guards the Tomb of the Unknown Soldier at Arlington National Cemetery.
Only four commemorative M17s were created for The Old Guard, and each bears a name and specific theme: Silence, Respect, Dignity, and Perseverance. These names are inscribed on each pistol’s dust cover, the area on the frame in front of the trigger guard.
The pistols also feature a unique high-gloss finish. While by itself, this finish may appear somewhat gaudy and out of place, the pistols are meant to be carried in glossy black holsters by The Old Guard. When holstered, the pistols’ finish looks far more fitting.
The slide serrations are also replaced with “XXI”, a nod to the twenty-one steps the guards take on their path patrolling in front of the tomb and the twenty-one-gun salute. However, “XXI,” in roman numerals, may also be a nod to the modern nature of the pistol, given that the Army titled its turn of the century modernization effort “Force XXI”.
Various materials of significance are also incorporated into the pistol. The wood grips are crafted from the deck wood of the USS Olympia, which carried the first Unknown Soldier who died in WWI to the United States in 1921. Marble dust from the tomb itself is placed in a glass vial (likely using recesses normally used to hold vials of tritium gas) in the front sight.