Which military branch was established on 20 December, 2019?

The military branch established on December 20, 2019, is the Space Force. This is significant as it marked the creation of the sixth branch of the United States Armed Forces, which focuses on organizing, training, and equipping military personnel for missions in outer space. The establishment of the Space Force reflects the increasing importance of space as a domain of military operations and addresses national security interests in that arena.

The creation of the Space Force underscores a contemporary shift in military strategy, recognizing space as a critical frontier for defense and conflict. This branch is primarily tasked with protecting U.S. and allied interests in space, developing new space-based technologies, and ensuring that the U.S. retains its strategic advantage in this domain.