7554, website 7554.vn
A very very old school First Person Shooter judging from gameplay videos on Youtube. Game engine is from Germany I think, but interestingly they used PhysX tech which is from the Yanks who call them Charlies. But anyway this is a game about war against the French in early 1950s, not the war in 1960s-70s. Not surprisingly there doesn't seem to have multiplayer. I guess the developer is not resourceful enough to maintain server operation.