Some randomness regarding the Geneva Conventions and the Hague...
The Geneva Conventions say nothing about ammunition. They do however say that a downed airman is NOT an enemy combatant unless he fights once on the ground. That is why the reminder is there for survival purposes. Once an airman evacuates his aircraft, as long as he does not attempt to fight, he should be recovered and protected as a POW. If he fights, he's fair game.
The Hague Declaraton of 1899 banned the use of expanding projectiles in response to the British use of expanding bullets produced at the factory in DumDum India. The US NEVER SIGNED the Hague Declaration of 1899, and is not legally bound by it. It's use of ball ammo is voluntary, and is not universal.
FWIW I carried an M9 with issued hollowpoints in both Iraq and Afghanistan legally.
