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Those are post cold war "fads", and are equipment for the 21st century military; see US Army small arms (21st century) websites. M147.62mm Rifle - - - - - You sight-in a M2 Browning with the M2 Browning itself.
The 21st century is referred to as such because it started in the year 2000, which is the beginning of the 21st century according to the Gregorian calendar. The numbering of centuries is based on the year in which they begin, not the ending year.
21st century B.C.
The ancient Egyptians far suppassed the intelligence of the 21st century Egyptians.
We are currently living in the 21st century because the calendar system we use, known as the Gregorian calendar, started counting from the birth of Jesus Christ. The 21st century began on January 1, 2001, and will end on December 31, 2100.