But with the exception of the first, the comics are crap.
Even that isn't 'warfare'. You can't engage in an eactual war against something which has no concept of the same. At most, it would be an 'open hunt', because each of those creatures would more than qualify as something worthy of taking a trophy from. But that's not the same thing as somehow trying to declare war. That was one of the things which does not make sense in the film of 'Starship Troopers'. The book depicted the things as intelligent, hostile arachnids, able to use technology, but by making them ordinary beasts, what was the point of declaring war on them? You might as well try and declare war on hurricanes.
Aliens aren't like Al Qaeda. There's no figurehead which has made some sort of media statement about declaring war on a nation. Aliens are just excessively territorial and will viciously defend themselves in every way they can In any case, there would be far easier ways of getting a host implanted with a Queen and ferrying it out of there, with their level of technology!