Which of the following is NOT a type of COMSEC transfer?

The option indicating "External Transfer" is not recognized as a type of COMSEC transfer because the primary COMSEC transfer methods typically address the movement of COMSEC material within defined organizational boundaries or between designated entities. The other types of transfers mentioned—Account to Account, Intra-Don, and Inter-Service—refer to more specific organizational structures or frameworks, facilitating the sharing or transferring of COMSEC materials among accounts within the same service or between different services (such as branches of the military).

In COMSEC policies, transfers must adhere to stringent guidelines to maintain security and control over sensitive information. External Transfer suggests a broader definition that might imply transferring COMSEC material outside the established and controlled environments, which is generally not approved under standard policies. Therefore, it is essential to understand that COMSEC procedures focus on secure and authorized transfers to maintain operational security and protect sensitive information from unauthorized access or disclosure.