Strange that you picked that example, considering it's the only instance where you could hope to argue that the 'war' was successful. You don't see much Communism these days, at least not in the tradition of Stalin and Mao.

On the other hand drug use is still a worthy adversary despite the US having waged a long and bitter war of attrition against it for decades. Also poverty, obesity, probably a bunch of other pet struggles we appropriated the word 'war' for.