Two US Marines have been killed and two severely injured in a plane crash during a training exercise in Morocco. Their MV-22 Osprey aircraft crashed in the desert after taking off from the amphibious assault ship USS Iwo Jima, a defense official tells AP. The men were among more than 1,000 Marines, soldiers, and airmen taking part in the annual African Lion military exercises alongside 900 Moroccan soldiers. (More US military stories.)