The Army started issuing the P320 full sized pistol and the P320 compact pistol, referred to by the Army as the M17 and M18 respectively, to the 101st Airborne Division in November of 2017. That said, it goes without saying that the US special operations community has a bit more leeway in their choice of weapons and gear, and in 2015 it was reported that the US Army Rangers, Special Forces groups and 160th SOAR (followed shortly by MARSOC) had chosen to outfit their units with the Glock 19. When the MHS competition was still ongoing, Army Chief of Staff General Mark Milley, who was base commander of Fort Hood while I was there, elected to allow the SOF community to go with the Glock 19 regardless of the outcome of the competition.