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Kim Ki Sam ©Stars and StripesSouth Vietnam, September, 1968: A Seabee from Naval Mobile Construction Battalion 62 has no room for error as he carries a sharp, heavy coil of barbed wire. The Seabees were working on the 16-mile-long "Da Nang Line," a watchtower-studded barrier intended to keep Communist infiltrators away from that city and the military installations surrounding it.

RELATED MATERIAL: Stars and Stripes' 1968 story about the "Da Nang Line."