Anchor: Why would a veteran of this one unit have any basis for knowing the total number of defectors in the entire Vietnam war?
Entailed: Would this veteran have any knowledge of the total number that defected during the Vietnam war?
Contradiction: Everyone knows that there were no defectors in the Vietnam war.
Contradiction: A man crosses the street, walking in the crosswalk.
Contradiction: The people were taking food and water into the mines. 
Contradiction: Most of them are really plain, though they are all antiques.
Contradiction: It can be terrible if you don't follow a knowledge-based process.