Mr. Glock's innovative design successfully passed a series of stringent tests against domestic and international competitors. In 1983, the GLOCK pistol was accepted by the Austrian Army as their new service pistol. Shortly after in 1984, the GLOCK 17 soundly passed the NATO durability test. As a result, the pistol was selected by the Norwegian Army as their standard sidearm, putting GLOCK on the road to becoming the preferred international law enforcement sidearm. In November 1986, the company opened its U.S. headquarters, GLOCK, Inc., in Smyrna, Georgia. The GLOCK pistol would soon be available in multiple sizes and accept different caliber ammunition. This combination, partnered with the simplicity and reliability of Mr. Glock's design, revolutionized the pistol market. Over 65% of federal, state and local agencies in the United States have been issued GLOCK pistols.