The Defense Department has spent more than $30 million over the past six years trying to find a way to help the 5 million American soldiers and civilians living abroad vote securely and efficiently, but no clear solution has been found so far. The Pentagon's current Web-based system is slow and confusing and filled with security and privacy problems, according to security experts and Congressional auditors, who say the system is vulnerable to undetectable hacking and vote tampering. Only 63 voters used it in the 2006 election to request and return ballots via the Internet, according to the Defense Department. Although the department is responsible for helping all overseas voters, civilians are not allowed access to the system