Top Halliburton executives asked to testify before the House Government Reform Committee tomorrow refused to appear to answer questions about the company’s contracting services in Iraq. Instead, Halliburton will send executives lower down in the chain of command. This will be the first time Halliburton officials have gone before a congressional panel to discuss thecompany’s performance. Four whistle-blowers will also appear before the panel to explain their charges against the company, including that personnel were ordered to abandon an $85,000 truck because of a flat tire.