SEOUL - Three South Korean ex-Air Force officers have been indicted for having allegedly leaked military secrets to a US defense company, local reports said Wednesday.

The officers, including the former head of the Air Force, allegedly leaked confidential military information to Lockheed Martin on a dozen occasions between 2004 and 2010.

The leaked information includes the Air Force's operational plans and arms purchase plans, and Lockheed Martin is believed to have based the data on their marketing plan, according to Yonhap News Agency in Seoul.