Fighter pilots can black out in seconds during high-G flying. Here's how flight experts say they train to stay conscious.

• Air Force pilots are extensively trained to prevent loss of consciousness during high-acceleration flights.
• The Anti-G Straining Maneuver helps pilots maintain consciousness when they fly.
• Technology such as the Automatic Ground Collision Avoidance System have reduced G-LOC accidents.

You're flying a fighter aircraft, and you are accelerating. But you're relaxed — a little too relaxed. Suddenly, you notice your peripheral vision beginning to fade. In what may be just seconds, you completely lose consciousness.

That's G-LOC, or G-induced loss of consciousness, and the results can be catastrophic.