Final answer:
M855 ball ammunition is identified by a green tip painted on the bullet, its design for penetration with a steel penetrator tip and lead core, and it is a 5.56x45mm NATO standard cartridge used in rifles like the M16.
Step-by-step explanation:
M855 ball ammunition can be identified by several distinct features that are standardized for military use. Firstly, the M855 rounds are identified by a green tip which is painted on the bullet. This is a clear marker that distinguishes it from other types of ammunition. Furthermore, the M855 is designed to penetrate hard targets since it is constructed with a steel penetrator tip and a lead core. This type of ammunition is commonly used in the rifle platform known as the M16 or its variants. Another specification is that the M855 cartridge is 5.56x45mm NATO standard and was designed for increased penetration at longer ranges compared to the earlier standard M193 round.