Two men

Two men are approaching each other on a side-walk.
Both are dragging their right foot.
As they meet, one man looks at the other knowingly, points to his foot and says: Vietnam, 1969
The other points his thumb behind him, and says -
Both are dragging their right foot.
As they meet, one man looks at the other knowingly, points to his foot and says: Vietnam, 1969
The other points his thumb behind him, and says -
Spoiler: