A woman is briefly shown nude from behind. Bare butt and side of breast visible. Master Chief is shown nude as well. Bare chest and buttocks shown.

Rear ends are occasionally shown in a non sexual manner.

One scene of sensuality with implied sex.

Bare buttocks and brief instances of side boob.

Although blood and gore are not lingered on, there are some gruesome scenes. Human bodies are blown up with plasma pistols and a few instances of dismembered bodies.

Kids are shown being killed, it is in brief flashes but still shocking.

Limbs and torsos are blown off with blood splatter. An alien has its face quickly melted by a plasma shot. There's a brief shot of a woman being cut in half by a sword. Civilians, including children, are shown being killed offscreen.

Far more gory, bloody and violent than the games

A group of hooded prisoners are lined up and shot in the head, one by one.

The bloody violence is infrequent and brief there's also brief instances of heads exploding. Never lingered on.

A few uses of "shit"

A Scottish man says "shite" and "arse" a few times.

None other than fictional space drugs.

Some very rare social drinking.

The violence and gore is pretty unexpected and may shock viewers.

A few intense battle scenes.