Although you wouldn't think it these days.

In related news, the Army is looking at cutting down on long-distance runs, and possibly eliminating them altogether.  I suppose there's a logical reason behind this other than the fact we have a lot of people in now that simply can not handle a longer-distance run, and we need to cater to the lowest common denominator these days. 

http://www.physorg.com/news95954919.html