The United States Army awards nicknames, officially called Special Designations, to units which are recognized as having earned or otherwise been associated with said designations. Mottos are also officially awarded to units by the U.S. Army. Under Army regulations, only those units to which official Special Designations (nicknames) and mottos have been awarded may associate themselves with said nicknames and mottos. In addition, members of these units are permitted to wear said nicknames and mottos on their uniforms. Under army regulations units with officially awarded nicknames and mottos may have only one of each. Additional nicknames and mottos are unofficial. Units and members of units with unofficial nicknames and mottos are prohibited by army regulations from adding said items to their division insignia, wear them on their uniforms, or mount them on their official guidons. Further, no unit may use or otherwise adopt a nickname or motto officially assigned to another unit. The following list of army nicknames and mottos contains both those which are officially recognized by the Army, as well as those which are not. The complete listing of official U.S. Army Special Designations can be seen at the U.S. Army Center of Military History website: U.S. Army Special Designations. If a unit is not listed here, its nickname is unofficial.
US Air Force unofficial motto: "Un Ab Alto" [One Over All]
US Air Force official motto: Above All
US Air Force Recruiting Mottoes: Do Something Amazing, Cross Into the Blue, Aim High