OV-10 Bronco / Cal FireCal Fire OV 10 Bronco airplane model. The North American Rockwell OV 10 Bronco is a turboprop driven light attack and observation aircraft. It was developed in the 1960s as a special aircraft for COIN (counter insurgency) combat, and one of its primary missions was as a forward air control (FAC) aircraft. It can carry up to three tons of external munitions, and easily loiters for three or more hours. Current CalFIRE aircraft have had all of the armor