Implies that to volunteer for a mission like this one, you need to have very little left to live for (i.e., to have suffered a huge personal loss or tragedy), which is rather sad.
Giant monster attacks. Characters killed. Some blood and gore: A man slices into another man's stomach in graphic detail, where his intestines are moving like snakes. Mangled corpses. Shocking, creepy, scary images. Guns and shooting. Rifle butt to face. Explosions. Injection in neck. Mention of a character's past self-harm.
A couple has sex (extramarital for them both): She's on top, shown from behind from the shoulders up, grinding and breathing; he's shown from the shoulders up, lying on the bed. Married couple shown in bed, wearing underwear and kissing.
Several uses of "f--k," plus "s--t," "damn," "bitch," "screw," and "God" (as an exclamation).