From the Source:
A large brush fire near Pohakuloa Training Area was apparently sparked late Wednesday by U.S. Marine Corps helicopters participating in RIMPAC exercises, military officials said Thursday.
Flares released by the UH-1Y and AH-1Z helicopters apparently ignited grass within an environmentally protected area in the vicinity of mile marker 44, said Lt. Cmdr. Julie Holland with the RIMPAC Combined Information Bureau Media Cell.