Disabled Veterans Not Applying for Social Security Disability Benefits?

The Congressional Budget Office reports that only 15% of those who receive Veterans' Disability benefits are also receiving Social Security disability benefits. It is unclear how many of these disabled veterans should be receiving Social Security disability benefits. Most of those on VA benefits receive only partial disability benefits, such as 10% or 20%, while Social Security disability benefits are either 100% or nothing. Also, many of the veterans are beyond Social Security's full retirement age and can no longer be eligible for Social Security disability benefits.