The 504th Expeditionary Air Support Operations Group is an inactive United States Air Force unit. It was first activated as the 504th Tactical Air Support Group in 1966 for service during the Vietnam War, and was reactivated in 2009 for service in Afghanistan. It was inactivated on 12 May 2016.

The North American Rockwell OV-10 Bronco is an American twin-turboprop light attack and observation aircraft. It was developed in the 1960s as a special aircraft for counter-insurgency (COIN) combat, and one of its primary missions was as a forward air control (FAC) aircraft. It can carry up to 3,200 lb (1,450 kg) of external munitions and internal loads such as paratroopers or stretchers, and can loiter for three or more hours.