38 C.F.R. § 21.6284
(a) Reentrance into rehabilitation to the point of employability following a determination of rehabilitation. A veteran in a vocational training program under this temporary program who has been found rehabilitated under provisions of § 21.196 of this part may be provided an additional period of training or services only if the following conditions are met and the veteran is otherwise eligible.
(2) The occupation for which the veteran previously was found rehabilitated under this temporary program is found to be unsuitable.
(Authority: 38 U.S.C. 1524(b)(1))
(b) Reentrance into rehabilitation to the point of employability during a period of employment services. A finding of rehabilitation to the point of employability by VA may be set aside during a period of employment services and an additional period of training and related services provided if any of the conditions in paragraph (a) of this section or one of the following conditions are met and the veteran is otherwise eligible:
(3) The veteran, because of technological change which occurred subsequent to the declaration of rehabilitation to the point of employability, is no longer able:
(ii) To secure employment in the occupation for which he or she trained, or in a related occupation.
(Authority: 38 U.S.C. 1524(b)(3))
[53 FR 4397, Feb. 16, 1988, as amended at 54 FR 8189, Feb. 27, 1989]