Battlestar Galactica

The central story is about a search for home, belonging, spirituality, and identity. The storylines featuring the often-tense relationship between the military and the civilian government, which is not bound by the chain of command, are complex, and demonstrate a nuanced understanding of the use, and abuse, of power. On the downside, there's plenty of betrayal to go around, and a robotic army is out to destroy the remains of humanity.

No explicit language, unless you count "frack," which is all too common among this offshoot of humanity and sounds quite similar to an expletive used on this planet (though it's managed to escape the ire of Earth's censors).

Many episodes feature scenes of soldiers drinking, usually in the context of blowing off steam after battle, and often while mourning fallen comrades. Many of these scenes make it clear that the characters are quite drunk; a couple of characters are clearly alcoholics. Occasional use of stimulants to keep the soldiers alert during extended shifts, and the show stresses the downside of abusing such drugs.