Information: - Air Combat Command (ACC) is one of ten Major Commands (MAJCOMs) in the United States Air Force, reporting to Headquarters, United States Air Force (HAF) at the Pentagon. - Offutt Air Force Base is a U.S. Air Force installation near Omaha, and lies adjacent to Bellevue in Sarpy County, Nebraska. It is the headquarters of the U.S. Strategic Command (USSTRATCOM), the Air Force Weather Agency, and the 55th Wing (55 WG) of the Air Combat Command (ACC), the latter serving as the host unit. - Maj. Gen. Roosevelt Mercer Jr. is the Director of Plans and Policy , United States Strategic Command , Offutt Air Force Base , Nebraska . He is directly responsible to the Commander , USSTRATCOM , for the development and implementation of national security policy and guidance , military strategy and guidance , space and weapons employment concepts and policy , and joint doctrine as they apply to the command and the execution of its missions . He is also responsible for the development of the nation 's strategic war plan , strategic support plans for theater combatant commanders , and contingency planning for the Global Strike mission . General Mercer is a 1975 graduate of the University of Puget Sound in Tacoma , Washington , and a distinguished graduate of its ROTC program . The general has commanded an ICBM operations squadron and operations group in North Dakota , as well as a spacelift logistics group in Florida . In addition , he commanded a space wing in California responsible for both satellite and ballistic missile test launch operations , followed by a training wing in Air Education and Training Command . The general also served as Vice Director of Plans , U.S. Space Command , Peterson AFB , Colo. ; Deputy Director of Operations , Headquarters Air Force Space Command , Peterson AFB ; and as the Commandant , Joint Forces Staff College , National Defense University , Norfolk , Virginia . Prior to assuming his current position , General Mercer was the Director of Combat and Information Operations , Global Operations Directorate , U.S. Strategic Command , Offutt AFB . - Command generally refers to the ability to "dominate an area of situation". There are several definitions of command and control (C2). According to older versions of U.S. Army FM 3-0, C2 in a military organization is the exercise of authority and direction by a properly designated commanding officer over assigned and attached forces in the accomplishment of the mission. The term may also refer to command and control systems within a military system. - The 55th Wing is a United States Air Force unit assigned to Air Combat Command. The wing is primarily stationed at Offutt Air Force Base, Nebraska, but maintains one of its groups and associated squadrons at Davis-Monthan Air Force Base, Arizona as a geographically separated unit. - United States Strategic Command (USSTRATCOM) is one of nine Unified Combatant Commands of the United States Department of Defense (DoD). It is charged with space operations (such as military satellites), information operations (such as information warfare), missile defense, global command and control, intelligence, surveillance, and reconnaissance (CISR), global strike and strategic deterrence (the United States nuclear arsenal), and combating weapons of mass destruction. What entity does 'roosevelt mercer' has the relation 'military branch' with?
A:
united states air force