Army May Not Withhold Halliburton Money  WASHINGTON (Reuters) - The U.S. Army reversed a decision  late Tuesday to withhold payment on 15 percent of future  invoices of Halliburton Co.'s &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=HAL.N target=/stocks/quickinfo/fullquote"&gt;HAL.N&lt;/A&gt; logistics deal in Iraq  and gave the company more time to resolve a billing dispute.