Saw this today: http://www.sportsmansguide.com/net/cb/cb.aspx?a=773038
(http://image.sportsmansguide.com/dimage/192030_ts.JPG?cell=300,300&cvt=jpeg)
Note the eyelets, and how the style more closely resembles the woodland camouflaged version of the genuine article.
Mike they are vent holes. Many baseball caps even have them
(Maybe it's just this picture but.....)Somebody call Chairman Mao and tell him we found his hat!!!! >:D