Ok, 3m might have been a bit exaggerated. But they should still be a fair bit longer than the longest natural human.
Have you actually TRIED to move through undergrowth or step hills? long legs should be ESPECIALLY good for that kind of thing. The only situations where short legs make moving easier is in bushy forest with a dense web of low branches which doesn't seem to be anywhere around here, or in tunnels or buildings with a low roof. The reason big animals are worse at moving in forest is because they are broad and heavy, not because they are tall.
Speaking of heavy animals not being able to move, another feature:
* very large flat feet like snow shoes to prevent sinking into the ground.
If we CAN make it quadruped, that'd be even better, but all my ideas about things like that have been shot down so I didn't even bother to mention it.
A clone-only combatant MIGHT be a good idea at SOME point, since we'll probably have a clone production capacity far outstriping our ability to arm the, but not at the moment. Making them worthwhile even then will probably require both much more varied DNA to base things on and more advanced techniques than we're currently using. Since decent armour is probably pretty hopeless, making them squishy but small, cheap, numerous, and good at dodging is probably the way to go. Offence is even more problematic, since anything with even a bit of armour is going to be untouchable. For infantry, finding a gap in armour and injecting venom might work. For vehicles... clocking the air intake with dead anon fodder is probably the best bet.
What absolutely does NOT work is sharp edges and big muscles and thick skin. Mitochondria just don't make the kind of materials needed to not be pathetic compared to even modern modern weapons and armor, and I assume future ones would be any worse. Sure, in theory you can do some pretty sweet things, but that's the realm of nanotechnology not biology, it not something we can design nor would it evolve naturally any aliens.
If we're not going to change the eyes and the legs of the scout clone more than ochita suggest then we might as well not bother making it at all and just send a normal clone.
And wow, these lasers SUCK. If that's actualy indicative of what we'll face when the exrement starts hiting the air conditioning then those rediculus cartoon monsters with scyte arms might work after all.