OSHA requires training and evidence that the training has been accomplished. One way to do this is to issue a license after the training has been successfully completed. I didn't see any requirement to have a divers license to get a fork lift license.
1910.178(l)(6)
Certification. The employer shall certify that each operator has been trained and evaluated as required by this paragraph (l). The certification shall include the name of the operator, the date of the training, the date of the evaluation, and the identity of the person(s) performing the training or evaluation.
don
