The technology, which typically costs $50,000 to $150,000 depending on the company and model, requires further development before it can head to the field.
The MQ-9 Reaper, which is made by unmanned aerial vehicles company General Atomics, has been used in many notable strikes across recent presidential administrations.
Earlier this year, Congress held its first hearing on UFOs in over a half century. During the hearing, lawmakers questioned Pentagon officials for more information about sightings of UFOs, with many lawmakers voicing criticism about a lack of transparency surrounding the issue.
Although legged robots have existed for several years, in order to be deployed, they would need to adapt in real-time to unseen scenarios such as changing terrains, changing payloads and wear and tear.