My experience with army recruits suggests that the training is so hard nothing could prevent injury - but that's another story!
This article does not address the issue of stretching improving sport performance though and other research does suggest that there is a positive relationship between the two.
To see the abstract of this article:
Stretching before or after exercise does not prevent muscle soreness or reduce risk of injury: systematic review BMJ Volume 325 pp 468-70, 451-2
Here are a couple of other resources on stretching:
The Myths and Truths of Streching. A review from the Physician and Sports Medicine
Stretching and Flexibility: Everything you never wanted to know - Website
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