I know that this has been in place for a really long time, but I have never heard it put this way before. This is taken from Bullet Glossary
Umm, isn't war about killing? I personally think war is insane, but this just seems quite odd, to be concerned about hurting someone you are trying to kill?FMJ: full-metal jacket
Military round specified by Geneva Convention. Metal surrounds lead or steel core to prevent additional mushrooming of bullet, which may cause inhumane wounding. Usually has lead-exposed base.