The Air Force said the jet, an A-10C Thunderbolt II, popularly known as the Warthog, "unintentionally released a single M-156 rocket" at about 10:40 a.m. while on a training mission.
The Air Force said the M-156, which fires white phosphorus smoke to help mark targets and start fires, went down in a desert wash about 60 miles northeast of Tucson in an uninhabited area under the Jackal Military Operations Area, which supports air-to-air and night training missions for Davis-Monthan and Luke Air Force bases.
"This training area is not designated for munitions release," the Air Force said.
https://www.nbcnews.com/news/us-news...esert-n1050571