In other words, it's not the bio-engineered solider with the special enhancements that should concern thinkers. It's the remotely-controlled soldier of 2050 operated from thousands of miles away. Our bio-enhanced guy will be sitting in a Starbucks in Deluth slurping down a double-latte, not marching off to war somewhere.
As robotics takes off in 20-40 years, we're going to see a very real division between countries that can field robotic armies and countries that cannot. All the engineering the world isn't going to make a human emit less infrared radiation, or stop having the electrical signals that form a heartbeat. The history of warfare is just as this article indicates: a tool-using species coming up with more and more efficient ways to slaughter each other. Robotics offers the ultimate tools in this area: targeted lethality, impervious to human frailties, and an Information Age cleverness. They'll make chemical and biological weapons -- and enhanced ground pounders -- look like a day in the park.
You really don't want to be a freedom fighter in the year 2050. Or piss off a major world power.