Glock pistols are not exciting, but they consistently work under just about any conditions. Probably the world’s most torture-tested handgun other than the Hi-Point C9, it has repeatedly proved itself to be indestructible except when found by a large breed dog with a proclivity for chewing on polymer.
This means that something like 65 percent of American police agencies as well as a huge slice of NATO’s armies (British, Dutch, Finnish, French, Norwegian, Polish, Portuguese, Swedish, etc.) carry some version of the Glock.
Heck, the G19 also had a long run with the Green Berets and Marines, among others, despite the Pentagon having officially gone with other 9mm pistols.