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In page 5.56×45mm NATO:

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  • Cartridge, Caliber 5.56 mm, Tracer, XM778: 5.56×45mm tracer cartridge mated with the XM777 Semi-Armor-Piercing cartridge.
  • Cartridge, Caliber 5.56 mm, Ball, M855 [Green tip]: 5.56×45mm 62-grain FN SS109-equivalent ball cartridge with a steel penetrator tip over a lead core in a full copper jacket. It is designed to penetrate lightly armored targets, such as body armor or light vehicles, and has a steel core that provides increased penetration.[citation needed]
  • Cartridge, Caliber 5.56 mm, Ball, M855LF Lead Free [Green tip]: 62-grain bullet with a steel penetrator tip over a tungsten-composite core in a full copper jacket. Primarily used during training in countries with strict lead disposal laws.