The X-37B returned to Florida after its sixth and longest mission.
The Boeing vehicle arrived at NASA's Kennedy Space Center in Florida early Saturday morning.
The Space Force said that NASA conducted a number of experiments.
The Space Force described the service module as a ring attached to the rear of the vehicle that expands the number of experiments that can be hosted during a mission.
There isn't much information about the X-37B's missions beyond that. There are few details about the experiments that took place on the latest flight.
The Naval Research Laboratory was involved in one of the experiments. Some materials were tested to see how long they would last in space. In order to explore crop production and the establishment of permanently inhabited bases in space, a third experiment was designed.
The X-37B continues to push the boundaries of experimentation, thanks to an elite government and industry team. The ability to conduct on-orbit experiments and bring them home safely has proven useful for the Department of the Air Force.