Time ? In the US Army Airborne School, which trains parachute jumpers for the Army, one of the Sergeants was demonstrating all of the possible failures that could happen to the equipment. In particular, he was explaining how many things could happen to keep the main parachute from opening. When one of the trainees asked, "If my parachute fails to open, how long do I have to open my reserve chute?" "Son, you have the REST of your life to deploy that reserve!", the sergeant drawled.