Final answer:
CW3 Clark's Class 2 FDME extension would typically last up to 6 months from the end of his birth month, February. Assuming it's the standard extension period, the extension would expire in August. Without the exact extension period, the exact expiration date cannot be determined.
Step-by-step explanation:
The question concerns the expiration of an extension granted for a Class 2 Flight Duty Medical Examination (FDME) which falls in the subject area of Health, specifically in relation to occupational health standards for military personnel. CW3 Clark's birth month, February, is the reference point for his original FDME window. Typically, such exams are conducted annually, and an extension can vary in length, but it is usually for a period of up to 6 months. Without specific details on the length of the extension granted to CW3 Clark, a precise expiration date cannot be given. However, if an extension is granted for the standard 6 months, then his approved extension would expire at the end of the birth month window plus six months, which would be in August.