38 C.F.R. § 21.6282
(a) Induction. Subject to the limitations set forth in § 21.6042 of this part, the date a veteran is inducted into vocational training shall be the earlier of:
(2) The date the program begins at the facility providing services.
(Authority: 38 U.S.C. 1524(b)(2))
(b) Termination. A veteran's training program shall be terminated under the provisions of § 21.6180. of this part.
(Authority: 38 U.S.C. 1524(b)(2))