The Fieseler Fi 103R Reichenberg was a type of airplane that was used by Germany during World War II to carry out suicide missions. The airplane was essentially a piloted version of their V-1 flying bomb, which was designed to be launched from the ground.
Picture a car that can drive without a driver. The Fieseler Fi 103R Reichenberg was a plane that could fly without a pilot. However, instead of being remotely controlled, it was flown by a person sitting inside the plane.
The Reichenberg was made with a one-way design in mind, which means that it was meant to be used only once. Its main purpose was for the pilot to steer it towards the target and then crash it into it, causing a lot of damage.
Imagine being told to ride your bike as fast as you can and then jump off of it onto a target. This is what the pilots of the Reichenberg had to do. They would fly towards their target and then jump out of the airplane before it crashed.
Unfortunately, the Reichenberg planes were not very successful. They experienced a lot of mechanical issues, and some pilots even died during the test flights. The suicide missions that they were supposed to carry out also never took place, which is a good thing because it means that fewer people were hurt or killed.