As interesting as it would be to have all of these real high tech actions going on, it's just not possible. The most simple explanation is usually the correct one. This is true largely because as the systems get more complex, they tend to break down in either disasters or leaked information or run out of funds. Most "dark ops" stuff is actually quite boring and very tedious. There's no anti-gravity, faster-than-light drives and teleporters working - the physics to even approach these concepts is way beyond our current understanding. That still doesn't mean that I wouldn't love to take a ride on a UFO sometime :)