Many of the characters have no qualms about lying to each other to achieve their goals. But most of the deception comes from above. It is the military administration that falsifies news or twists tragedies to make themselves look good to the American public or boost morale. This includes covering up unsightly or politically compromising deaths and failures. In contrast, a few characters do adhere to a moral code. In the midst of corruption, they try to remain loyal to their friends, to be honest, to consider the well being of their fellow men, and to mourn when there are deaths.
Because the enlisted men concentrate mainly on staying alive, they do not show a united movement of integrity; instead, integrity is shown only on the individual level.
Because the enlisted must concentrate on staying alive, they pull together to show their strength against the corrupt administration; their collective integrity plays counterpoint to the integrity shown on the individual level.