First off, I think Arenamontanus is correct. One of Eclipse Phase's quirks is that it often lets players think up creative solutions to problems. In one Actual Play I heard, the player characters spent most of the game sitting naked on their ship, researching, scheming and networking, and let Forks do most of the legwork. So don't be surprised if the players find some brilliant way to avoid planned combat encounters, or waltz right through them. In general, from the perspective of an intelligent, creative opponent, combat is usually the least efficient way to get something done. That said... Seconding Azathoth's suggestion. NPC File 1 has some good NPCs in it. The Criminal Enforcer, Gang Member, Jovian Soldier, Pirate or Security Trooper templates could all potentially work as your Soldier (though note that the Aptitudes for the Jovian Soldier are broken...). For the "Giant Rat", I suggest a Security AI (p. 332) in an appropriate robot (p. 330 and 346), armed with a light weapon. For instance, you could have Security AI Saucers launch from specially designed sockets in the walls of a space station, armed with Laser Pulsers and Microwave Agonizers. Not much of a threat individually, but they can gang up (at least on lightly-armored targets), spot for Indirect Fire weapons, and maybe kamikaze themselves against harder targets (if they are purposefully constructed to do this, then I would personally treat their sharpened edges as Monofilament Swords). For the Soldier, you could use the aforementioned Templates from the NPC File 1, or you could go with a somewhat more powerful robot, like a Guardian Angel. Whatever you decide to use, just make sure that it has weapons which can reliably penetrate armor (which is something that player characters tend to stack up on). For a truly prodigious combat monster, go with the Dwarf Bot or the Hyperdense Exoskeleton (p. 344), mount a Cyberbrain, and stock up on Personal Augmentations and heavy weapons on Weapon Mounts. This is essentially a mobile artillery platform, so go to town. [url=http://www.firewall-darkcast.com/node/291]Here are some optional rules for heavy weapons[/url], if you feel so inclined. Not sure how helpful this will be, but there are two tables on p. 174 which you might find helpful in statting up NPCs.

Also keep in mind one of the deadliest things you can do to make NPC scary is to give them Moxie Stat. The ability for the NPC to ignore Penalties, Chose the higher of the 2 die as 10s, etc. is a huge boost.