A buttstroke is an act of striking a person with the butt of a rifle.
At ease, port arms, on guard, high guard, short guard. Others are movements and not positions, such as short thrust, long thrust, slash, vertical buttstroke, horizontal buttstroke, smash.
Bayonet fighting really is an obsolete fighting method to be used in modern warfare. IF (and I really would like to know where you heard this from) they are doing away with it completely, that would be the main reason, especially given the current operating environments. In urban warfare, fixing a bayonet to your rifle only increases its length, which is undesirable in close-in conditions. If someone jumps out at you in a hallway and engages you in hand-to-hand combat, you're not going to have the sort of space you would need to thrust, parry, buttstroke, and do all the other moves you learn in your bayonet training. If you read accounts of hand-to-hand fights in Iraq, for example, you'll see they typically dispatch their enemy with a combat knife, or else beat them into submission. You're not going to be on patrol with a bayonet fixed to your rifle, because it ruins the barrel harmonics, which reduces the accuracy of the weapon.>According to the news it was to concentrate upon physical conditioning of the soldiers . See link to news article below .