Lockheed, Northrop Face Big Cuts-Document  WASHINGTON (Reuters) - Lockheed Martin Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LMT.N target=/stocks/quickinfo/fullquote"&gt;LMT.N&lt;/A&gt; and  Northrop Grumman Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NOC.N target=/stocks/quickinfo/fullquote"&gt;NOC.N&lt;/A&gt; would bear the brunt of proposed  cuts in U.S. weapons purchases totaling \$30 billion over the  next six years, according to the summary from a Pentagon budget  document made available to Reuters Monday.