Joint terminal attack controller

Joint Terminal Attack Controller (JTAC) is the term used in the United States Armed Forces and some other military forces for a qualified service member who directs the action of military aircraft engaged in close air support and other offensive air operations from a forward position. The term that is used in most other countries, as well as previously in the U.S. and in the relevant NATO standard, is Forward Air Controller.

Source: Wikipedia — Joint terminal attack controller (CC BY-SA 4.0)