I don't know if the story is true or not. Hell, they may still be telling it in AIT.
Story is that the board? officials? who ever does that stuff heard that the United States was using the 50 Caliber Machine Gun as a sniper rifle. They were mounting a scope, loading one round and shooting troops at over 3000 meters. They were not only shooting individuals but if the men were in line they were taking out 3 or 4 at a time. The officials with the Geneva Convention called the United States in for a meeting and explained that the weapon was being used for something other than it was designed for. The United States had offered the weapon to be used on equipment, light vehicles and aircraft. The complaint was that it was being used on soldiers also which would be a violation of the convention rules.
The United States representative never hesitated and said that he understood the Conventions presentation of the facts and would make sure that the United States would use the weapon for what it was designed for. They wouldn't use the weapon against troops again. Only equipment, light vehicles, and aircraft. Such as: LCE's, canteens, weapons, rucksacks, vehicles and airplanes. Got up and left. They never changed the way they were using the 50.
For those of you that don't know, and I'm no expert, the Geneva Convention was drawn up and signed by several countries many years ago. Several countries didn't sign it. Since that time several of the countries have changed governments and no longer recognize the authority of the Geneva Convention. Therefore, most of the countries we go up against aren't governed by the Geneva Rules.
The Geneva Convention allows or disallows certain weapons to be used by the countries that have signed and agree to follow the rules. Each country, before it introduces it into it's inventory, must present it to the Geneva Convention and have it voted on. They tell that country whether they can or cannot use that weapon. It keeps war fair, to an extent.