A US Marine Corps search-and-rescue helicopter crashed during a training flight over southwest Arizona, killing four people on board, officials said Friday. One person survived. The UH-1N Huey crashed about 20 miles (32 kilometers) north of Yuma on Thursday. The wreckage was discovered early Friday, and three Marines and one Navy sailor were pronounced dead at the scene, said 1st Lt. Rob Dolan, a spokesman for the Marine Corps Air Station in Yuma. The injured Marine was transported to Yuma Regional Medical Center and is listed in stable condition.