Ex-Boeing Exec Sentenced on Conspiracy  ALEXANDRIA, Va. (Reuters) - The former No. 2 weapons buyer  for the U.S. Air Force, Darleen Druyun, was sentenced on Friday  to nine months in prison for negotiating a \$250,000 job with  Boeing Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=BA.N target=/stocks/quickinfo/fullquote"&gt;BA.N&lt;/A&gt; while still overseeing billions of dollars of  its business with the military.