-You’d need to show proof of an honorable discharge, validated by a DD-214
-Your 8 years of service would exceed the minimum time served requirement, assuming service in Vietnam is also claimed
-Any service-connected disability also factors into the amount of additional points that can be gained/claimed

Further infirmation is here:

https://www.fedshirevets.gov/job/shav/index.aspx

“Veterans’ Recruitment Appointment (VRA) is an excepted authority that allows agencies, to appoint eligible veterans without competition. If you:

are in receipt of a campaign badge for service during a war or in a campaign or expedition; OR
are a disabled veteran, OR
are in receipt of an Armed forces Service Medal for participation in a military operation, OR
are a recently separated veteran (within the last 3 years), AND
separated under honorable conditions (this means an honorable or general discharge), you are VRA eligible.
You can be appointed under this authority at any grade level up to and including a GS-11 or equivalent. This is an excepted service appointment. After successfully completing 2 years, you will be converted to the competitive service. Veterans’ preference applies when using the VRA authority.

Agencies can also use VRA to fill temporary (not to exceed 1 year) or term (more than 1 year but not to exceed 4 years) positions. If you are employed in a temporary or term position under VRA, you will not be converted to the competitive service after 2 years.

There is no limit to the number of times you can apply under VRA.

You must provide acceptable documentation of your preference or appointment eligibility. The member 4 copy of your DD214, “Certificate of Release or Discharge from Active Duty,” is preferable. If claiming 10 point preference, you will need to submit a Standard Form (SF-15Adobe Acrobat Version [152 KB]), “Application for 10-point Veterans’ Preference.”