The US Air Force employs two kinds of AOCs: regional AOCs (the AN/USQ-163 Falconer) that support geographic combatant commanders, and functional AOCs that support functional combatant commanders. When there is more than one military service working in an AOC, it is called a Joint Air and Space Operations Center (JAOC). In cases of allied or coalition (multinational) operations, the AOC is called a Combined Air and Space Operations Center (CAOC).