keywords: pleads guilty detainees frederick pleaded
text: Army reservist in Iraq pleads guilty in prisoner abuse court &lt;b&gt;...&lt;/b&gt; US Army reservist Staff Sgt. Ivan  #39; #39;Chip #39; #39; Frederick pleaded guilty Wednesday to five charges of abusing Iraqi detainees at Abu Ghraib prison as a two-day court-martial opened at a US base in Baghdad.