Final answer:
The Occupational Safety and Health Administration (OSHA) requires all forklift operators to be trained in the safe and efficient use of a forklift.
Step-by-step explanation:
The organization that requires all forklift operators to be trained in the safe and efficient use of a forklift is the Occupational Safety and Health Administration (OSHA).
OSHA is an agency of the United States Department of Labor and was established under the Occupational Safety and Health Act. Their mission is to assure safe and healthful working conditions for workers by setting and enforcing standards and providing training and assistance.
OSHA's regulations include requirements for employers to provide training for certain dangerous jobs, such as forklift operation, in a language and vocabulary that workers can understand.