Which of the following is NOT a requirement for licensing as an RCP in Texas?

Obtaining a high school diploma is not a requirement for licensing as a Respiratory Care Practitioner (RCP) in Texas. The main focus for RCP licensure centers around the completion of an accredited respiratory care program, as this ensures that individuals have received the necessary education and training that meet the standards set for practicing professionals in the field. Passing the national board examination is another critical component, as it assesses the candidate's knowledge and competency in respiratory care practices. Finally, submitting an application to the Texas Medical Board is essential for formal recognition and approval to practice as an RCP. Thus, while educational qualifications are crucial, a high school diploma is not specifically mandated for licensure, making it the correct choice as the requirement that is NOT needed.