38 CFR § 21.42 - Deferral or extension of the basic period of eligibility.
The basic period of eligibility does not run as long as any of the following reasons prevents the veteran from commencing or continuing a vocational rehabilitation program:
(a) Qualifying compensable service-connected disability(ies) not established. The basic period of eligibility does not commence until the day VA notifies a veteran of a rating determination by VA that the veteran has a qualifying compensable service-connected disability under § 21.40.
(b) Character of discharge is a bar to benefits.
(1) The basic period of eligibility does not commence until the veteran meets the requirement of a discharge or release under conditions other than dishonorable. (For provisions regarding character of discharge, see § 3.12 of this chapter.)
(2) If VA has considered a veteran's character of discharge to be a bar to benefits, the basic period of eligibility commences only when one of the following happens:
(i) An appropriate authority changes the character of discharge or release; or
(ii) VA determines that the discharge or release was under conditions other than dishonorable or that the discharge or release was, but no longer is, a bar to benefits.
(3) If there is a change in the character of discharge, or the discharge or release otherwise is determined, as provided in paragraph (b)(2) of this section, not to be a bar to benefits, the beginning date of the basic period of eligibility will be the effective date of the change or VA determination.
(c) Commencement or continuation of participation prevented by medical condition(s).
(1) The basic period of eligibility does not run during any period when a veteran's participation in a Veteran Readiness and Employment (VR&E) program is determined to be infeasible for 30 days or more because of any medical condition(s) of the veteran, including the disabling effects of chronic alcoholism (see paragraphs (c)(2) through (c)(5) of this section).
(2) For purposes of this section, the term disabling effects of chronic alcoholism means alcohol-induced physical or mental disorders or both, such as habitual intoxication, withdrawal, delirium, amnesia, dementia, and other like manifestations that:
(i) Have been diagnosed as manifestations of alcohol dependency or chronic alcohol abuse; and
(ii) Have been determined to prevent the affected veteran from beginning or continuing in a program of VR&E.
(3) A diagnosis of alcoholism, chronic alcoholism, alcohol dependency, or chronic alcohol abuse, in and of itself, does not satisfy the definition of disabling effects of chronic alcoholism.
(4) Injuries sustained by a veteran as a proximate and immediate result of activity undertaken by the veteran while physically or mentally unqualified to do so due to alcoholic intoxication are not considered disabling effects of chronic alcoholism. An injury itself, however, may prevent commencement or continuation of a rehabilitation program.
(6) If the basic period of eligibility is delayed or interrupted under this paragraph (c) due to any medical condition(s) of the veteran, it will begin or resume on the date a Counseling Psychologist (CP) or Vocational Rehabilitation Counselor (VRC) notifies the veteran in writing that the CP or VRC has determined, based on the evidence of record, that participation in a VR&E program is reasonably feasible for the veteran.