Each of his men was part of a two-man team for mutual support - there is nothing so fearful as to be alone in a combat action, and the effectiveness of any soldier is multiplied many times over merely by having a single comrade at his side.  Each pair had dug three holes - called Primary, Alternate, and Supplementary - as part of three separate defensive networks, all of them camouflaged and carefully sited to be mutually supporting.  Where possible, fire lanes were cleared, but always on oblique lines so that the fire would take the attacker from the side, not the front, and part of the plan was to force the attacker to move in a direction anticipated by the Team.  Finally, if everything broke down, there were three preplanned escape routes and corresponding rally points.  His men kept busy all day, digging their holes, preparing their positions, siting their remaining claymore mines, until their rest periods were occupied only with sleep and not conversation.  But he couldn't keep himself quite that busy, and couldn't keep himself from thinking?