U.S. Military Returns to the Jungle, Training for Future Threats

One by one, the American soldiers slid down a muddy hillside to a river deep in the Hawaiian jungle. With guns on top of rucksacks, they kicked their way across, wobbling in the current, trying to stay quiet. It was a sluggish advance stinking of sweat and silt — reminiscent of Vietnam, and similar to what they might face in a potential fight with China almost anywhere in the Pacific. “It’s incumbent on us to become resident professionals,” said Col. Christopher D. Johnson, who traversed the river arm in arm…