38 USC 3741 - Definitions

For the purposes of this subchapter
(1) The term disabled veteran means
(A)  a veteran who is entitled to compensation under laws administered by the Secretary for a disability rated at 30 percent or more, or
(B)  a veteran whose discharge or release from active duty was for a disability incurred or aggravated in line of duty.
(2) The term veteran of the Vietnam era means a person
(A)  who served on active duty for a period of more than 180 days, any part of which occurred during the Vietnam era, and who was discharged or released therefrom with other than a dishonorable discharge, or
(B)  who was discharged or released from active duty for a service-connected disability if any part of such active duty was performed during the Vietnam era.