Colt first sold the DOD on the M-16! And, it's probably true to some degree. But, it really depends on distance to target and whether it hits bone or not. The cartridge is considered in the varmint class of cartridge in the hunting world. That means that it's a good cartridge for a long range, open shot at something in the 1 LB to 20 LB range. Most hunters consider the 223 Remington (Civilian version of the 5.56mm FMJ) a bad choice for man sized animals like deer. The high speed, light bullet is easily deflected by a branch or twig in flight and, at short ranges, will pass on right through a body with little damage if it doesn't contact bone.
As the present day gameplan for future conflicts say that fighting will move from the woods and jungles into urban cities, a high speed, light cartridge is not the best choice for that type of fighting. Although there is an advantage for a fireteam to have weapons that all fire the same cartridge, there will probably be a need to change the make up of today's fire team. They may need rifle and automatic fire of one caliber and a long range, sniper capable rifle. One possible choice may be to change to a cartridge like the 7.62x39mm which has better knockdown and still has fair long range ballistics.
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