American soldiers of the US 28th Infantry’s 1st Battalion scramble for cover as Viet Cong guerrillas open fire from concealed tunnels in an enemy stronghold 25 miles northwest of Saigon, Jan. 9, 1966. The unit, part of Operation Crimp, a massive allied assault, had just settled down for lunch when the Viet Cong attacked. (AP Photo/Horst Faas)
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