This Hetalia wallpaper contains
green beret, special forces, elite soldier, navy seal, seal, and rifleman.
There might also be
fatigues and regimentals.
China, Vietnam, Taiwan, Japan Thailand, Korea, Hong Kong, Tibet, Mongolia, Philippines (OC) But pause at 3:04, the pic in the background shows OCs like Cambodia (the one next to Vietnam and going to the right), Malaysia, Indonesia and Philippines