United States Navy, United States Marine Corps, and United States Air Force were also detailed to the Space Force. 16,000 military and civilian individuals in total were assigned to the Space Force at its creation. Air Force space airmen began transferring to the Space Force in FY 2020, while Army space soldiers, Navy space sailors, and space marines will begin transferring in fiscal year 2022 (1 October 2021–30 September 2022). The Space Force is creating career tracks for Space Force Core Organic specialties, including space-specific operations, intelligence, engineering, acquisitions, science, and cyber/communications. Support specialties, such as legal, medical, civil engineering, logistics, financial management, security forces, and public affairs will be detailed by the Air Force to support the Space Force. Space Force service members are known as guardians. The title of guardian has a long history in space operations, tracing its heritage to Air Force Space Command's 1983 motto, Guardians of the High Frontier. It was announced to commemorate the Space Force's first birthday by Vice President Mike Pence on 18 December 2020. Following the creation of the Space Force, they were referred to as space professionals on an interim basis until a final name was selected. Rank structure Officer corps On 18 April 2020, the United States Air Force Academy graduated the Space Force's first 86 new second lieutenants. Space Force officers are commissioned through the United States Air Force Academy, Air Force Reserve Officer Training Corps programs at civilian universities, and Air Force Officer Training School. The Air Force Academy is considered the premier commissioning route for Space Force officers, having a Space Force detachment which provides Space Force training, immersion, and mentorship to cadets. The Department of Astronautics was established in 1958, and the Cadet Space Operations Squadron was established in 1997. Space Force officers attend Air University at Maxwell Air Force Base for professional military education, which has space-specific programs including the Space Gray Rhinos program at Squadron Officer School for captains; the Schriever Space Scholars program at Air Command and Staff College for majors; and the West Space Seminar at Air War College for lieutenant colonels and colonels. A small number of Space Force and Air Force officers attend the School of Advanced Air and Space Studies. Space Force officers specialties include: 13S - Space operations officer 13SA - Orbital warfare officer 13SB - Space electronic warfare officer 13SD - Space battle management officer 13SE