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...[[Tan beret|beige or tan]] of Commonwealth special forces units ([[Special Air Service|SAS]], [[CSOR]]) and [[U.S. Army Rangers]], or the wide black of Fr [[Image:SASR.jpg|thumb|An Australian Special Air Service Regiment beret.]]

...slightly less dense than the surrounding water, which exerts a [[buoyant]] force on it. Thus staying afloat requires only a slight propelling of water downw ...modest increases in the acceleration of their hips doubled their peak hand force output.