Final answer:
In the context of aviation law, individuals who choose to operate under an FAA certificate do not need DD Form 2992.
Step-by-step explanation:
In the context of this question, the subject is aviation law. When it says, "may opt to fly under an FAA certificate ONLY," it is referring to individuals who choose to operate an aircraft under the authorization and oversight of the Federal Aviation Administration (FAA).
DD Form 2992 is a form used in the U.S. military to verify pilot qualifications, but it is not required for individuals operating under an FAA certificate.
Therefore, the statement means that those who choose to operate under an FAA certificate do not need to fill out the DD Form 2992.