So far with the exception of the Reaper and the new Fenrir I have yet to find anything that screams heavy artillery. Arguably there isn't much need for such gear seeing as if you as a player or you as a GM find yourself caught using strategic assets, you're'/they're done for anyway. However, because I like the heavy gear I'd like to throw around some ideas as to what kind of military/strategic assets each faction might be privy to. Things such as tanks, APCs, Fighter air/space craft, exoskeletons, power armor, light vehicles. That kind of thing, and then couple them with rules, (obviously most of these are going to be vehicles) though there should be some morphs other than the Fury and Reaper and Olympian (discussed at length in other posts) that are specifically geared for war and combat but fill a more specialized or more general role. As a note we can also throw in starships, corvettes, cruisers, dreadnoughts etc. (discussed but not quite detailed in other posts [that I can remember anyway]). Another great thing to look at would be more combat/strategic/tactical weapons, heavy armaments other than the plasma rifle, etc.
I might be over thinking this but I like these discussions.
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"And yet, across the gulf of space, minds immeasurably superior to ours regarded this Earth with envious eyes. And slowly, and surely, they drew their plans against us."