Each phase of the ejection sequence is associated with characteristic injury patterns and of particular concern is the occurrence of spinal compression fractures, which are caused by the upward acceleration of the ejection seat.
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Your spine gets compressed as your butt moves upward while your head (and helmet) push downwards with an apparent weight of 50 pounds. There is a real risk of ruptured vertebral discs, even broken neck or back from being seated incorrectly, particularly with older model ejection seats.
If the pilot needs to warn you that you're going to have to eject in the near future, he will use the word “eject,” as in, “Hey, get ready, we are going to have to eject in about 30 seconds.” If things go horribly wrong and you need to blow out of the ship immediately, the command is, “bailout! bailout! bailout!”
Not true. I flew with a pilot that had ejected three times. Weirdly, I was with him (in another A-7) on two of those occasions. All three ejections occurred at slow speeds.