Complex sentence: Nevertheless, current helicopters are outfitted with latest generation U.S. night vision equipment, reserved for U.S. armed forces and the armies of their allies and thus the only civilian registered aircraft in the world, so equipped.
Split into simpler sentences: Nevertheless, current helicopters are outfitted with latest generation U.S. night vision equipment, reserved for U.S. armed forces and the armies of their allies. And thus the only civilian registered aircraft in the world, so equipped.