CBS News investigative correspondent Sharyl Attkisson reports high-level, closely-held meetings are taking place at the Pentagon regarding a radical proposal to overhaul retirement for the nation’s 1.4 million service members - a bedrock guarantee of military service.

The proposal comes from an influential panel of military advisors called the Defense Business Board. Their plan, laid out in a 24-page presentation “Modernizing the Military Retirement System,” would eliminate the familiar system under which anyone who serves 20 years is eligible for retirement at half their salary. Instead, they’d get a 401k-style plan with government contributions.