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There are many problems of safety in paratrooper drops. Many times night jumps are done or drops are made into the battlespace under low visibility. This is good and bad. It is good because the enemy cannot see you as easy to kill you, but bad because you cannot see anything either.
from: http://ezinearticles.com/?Automated-Following-Jump-System-for-Paratroopers,-AFJS&id=42334
