LitCharts assigns a color and icon to each theme in The 5th Wave, which you can use to track the themes throughout the work.
Trust and Belief
Survival and Perseverance
Warfare and Dehumanization
Family
Summary
Analysis
The first night with Ringer in the barracks is awkward. Zombie has become leader of the squad, but Ringer questions his authority, saying she used to be the leader of her old squad. When Ringer asks if anyone plays chess, Flintstone makes a joke about strip poker, and Ringer knocks him to the floor.
Ringer’s interest in chess suggests that she is thoughtful and strategic. Meanwhile, Flintstone’s comment about strip poker hints at the toxic macho attitudes that have grown within their squad, perhaps with Reznik’s encouragement.