Hong Kong's elite paramilitary unit, nicknamed "Flying Tigers", modelled after and trained by the british SAS before the handover back to China in 1997. The unit became famous/popular after "The Final Option" movie came out in Hong Kong in 1994 starring Michael Wong as a harsh but firm leader of the unit.
These SDU figures ("Assaulter" and "Breacher") by Hot Toys in 2003 have the muscle bodies which have very limited articulation. I think they are too bulky for the SDU; US Navy SEAL maybe but asians aren't built like bulldozers LOL!!
The Avon SF10 Respirator with AN-PVS17 NVD - very NICE!!
Also has multi-purpose tool and three types of grenade
SDU Leader, LT Stone Wong