How do you right a signature block for a retired USAF chaplain Colonel?

To write a signature block for a retired USAF Chaplain Colonel, format it as follows:

[Full Name], COL, USAF (Retired)
[Contact Information]
[Optional: Address]
[Optional: email Address]
[Optional: Phone Number]

Ensure to use the title "COL" for Colonel and include "USAF" to denote the United States Air Force, followed by "(Retired)" to indicate their retired status.