Tunnel warfare, Vietnam War... are all based on tunnels, and in this movie, no advanced weapons are needed, just hardcore. With the skills of killing, the US military did not know how many died in the tunnels of Vietnam, and could only use moles to fight the tunnels of Vietnam. In the war of resistance against Japan that year, the tunnels in the country also caused great damage to the Japanese army. But because of the times, it doesn't seem so exciting now. If this movie is shot like this, it must be very beautiful. To expand a little, the army did not rely on advanced weapons, but on the skills of interspersed and divided, one by one fighting squads, if used in the movie, the effect will definitely be exciting. But this is a very test of the director's operational ability.
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