Multi-type helicopters fly in formation at extremely low altitude. A WZ-19 attack helicopter R , a WZ-9 attack helicopter (C) and a transport helicopter (L) fly in formation at extremely low altitude during a realistic training exercise in early April, 2017. Monday, April 17, 2017 16:17:41. Chinese navy rescues Panamanian ship from pirates in Gulf of Aden. China rolls out new occupation skill appraisal provisions for active soldiers. China, Switzerland pledge to advance military-to-military cooperation.