; or (B) from any source other than this section. (3) Reasons for not approving training programs The Commission shall not approve a training program if— (A) all or a portion of the costs of such training program are paid under any nongovernmental plan or program; (B) the adversely affected worker or adversely affected incumbent worker has a right to obtain training or funds for training under such plan or program; and (C) such plan or program requires the worker to reimburse the plan or program from funds provided under this Act, or from wages paid under such training program, for any portion of the costs of such training program paid under the plan or program. (c) Supplemental assistance The Commission may, where appropriate, authorize supplemental assistance necessary to defray reasonable transportation and subsistence expenses for separate maintenance when training is provided in facilities which are not within commuting distance of a worker's regular place of residence. The Commission may not authorize— (1) payments for subsistence that exceed whichever is the lesser of (A) the actual per diem expenses for subsistence, or (B) payments at 50 percent of the prevailing per diem allowance rate authorized under the Federal travel regulations; or (2) payments for travel expenses exceeding the prevailing mileage rate authorized under the Federal travel regulations. (d) On-the-Job training requirements (1) In general The Commission may approve on-the-job training for any adversely affected worker if— (A) the worker meets the requirements for training to be approved under subsection (a)(1); (B) the Commission determines that on-the-job training— (i) can reasonably be expected to lead to suitable employment with the employer offering the on-the-job training; (ii) is compatible with the skills of the worker; (iii) includes a curriculum through which the worker will gain the knowledge or skills to become proficient in the job for which the worker is being trained