XGAM-71 Buck Duck is a missile that was used by the US Air Force back in the 1950s and 1960s. It was designed to be launched from a plane and used to attack ground targets, like enemy tanks or buildings.
The missile had a big, pointy nose that had sophisticated sensors inside it. These sensors helped the missile to "see" its target and direct itself towards it. Once the missile was close enough to the target, it would explode and cause a lot of damage.
"Buck Duck" was just a code name given to the missile by the military. It didn't have anything to do with what the missile actually did.
Overall, the XGAM-71 Buck Duck was a pretty advanced weapon for its time, and it helped the US Air Force to carry out important military operations.