A variety of Belltower Spec Ops, Sneakers are usually deployed with Ogres and Soldiers. All of their limbs are augmented, and some major ventral augs are also installed to allow invisibility and ballistic shielding.
Although Sneakers are not especially tough, and actually weaker than the typical soldier, they are capable of using the Glass-shield Cloaking System, making them virtually invisible, but this limits them to smaller weapons such as pistols and machine pistols.
Although their cloaking makes them near undetectable, Sneakers will usually be shooting whenever possible and can also be seen moving on occasion - the environment ripples as they pass - giving away their location. They are also somewhat more mobile than other enemy types, making them susceptible to mines (gas mines are recommended because the effect will last longer and possibly drop more hostiles). Simply hiding behind cover and striking once with a powerful weapon such as the Sniper rifle or shotgun will finish them off quickly. A well-placed EMP grenade can cripple them, and a M1-A Frag Grenade can finish them off just as easily. Smart Vision will make fighting these enemies trivial.