The U.S. military's health care system attracts doctors who couldn't legally practice in the private sector, according to an investigation by the Dayton, Ohio, Daily News. The newspaper alleges the military employs or has employed physicians who failed multiple state medical board exams, had their licenses revoked or suspended, lost their malpractice insurance or were convicted of crimes.

• The year-long investigation found that military doctors are not required to have malpractice insurance, do not have to be licensed in every state where they practice, and are virtually immune from being sued by their patients.

• Reporters say they found at least 200 doctors practiced in the military with records of incompetence or malpractice from both in and out of the military.

• They also found 77 doctors either failed their state licensing exam or had no evidence in their files that they took it.

• One doctor reportedly failed a medical licensing exam 30 times.

John Mazzuchi, deputy assistant secretary of defense for clinical services, said that differences between civilian and military health care systems don't decrease the quality of care in the services and that military hospitals rate highly compared to others.