The US Space Force (USSF) was established in December 2019 and is the space warfare service branch of the US military. Its mission is to organize, train, and equip space forces in order to protect U.S. and allied interests in space and to provide space capabilities to the joint force. Its responsibilities include developing military space professionals, acquiring military space systems, maturing the military doctrine for space power, and organizing space forces to present to the Combatant Commands.