38 C.F.R. § 21.284
(a) Reentrance into rehabilitation to the point of employability following a determination of rehabilitation. A veteran who has been found rehabilitated under provisions of § 21.283 may be provided an additional period of training or services only if the following conditions are met:
(3) The occupation for which the veteran previously was found rehabilitated under Chapter 31 is found to be unsuitable on the basis of the veteran's specific employment handicap and capabilities.
(Authority: 38 U.S.C. 3101(a))
(b) Reentrance into a program of independent living services following a determination of rehabilitation. A finding of rehabilitation following a program of independent living services may only be set aside, and an additional period of independent living services provided, if the following conditions are met:
(1) Either:
(2) The provisions of § 21.162 pertaining to participation in a program of independent living services are met.
(Authority: 38 U.S.C. 3109)
(c) 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 following conditions are met:
(4) 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. 3117)
[49 FR 40814, Oct. 18, 1984, as amended at 58 FR 68769, Dec. 29, 1993]