The Soldier (2005)

A group of civilians join the Army temporarily as volunteers to combat drug trafficking and border incursions near Burma. On an exercise into the jungle they find a place full of strange figures. They go back to base and discuss their findings with a monk. A Karen woman says the place is haunted. The monk says it isn't and goes back in there with them to prove it but they are captured by the Karen rebels.

Unfortunately the movie The Soldier is not yet available on HBO Max.