Final answer:
The proper Title of Address for a Lieutenant Colonel is “Lieutenant Colonel Last Name” in both the recipient’s address and the salutation of a business letter.
Step-by-step explanation:
The proper Title of Address for a Lieutenant Colonel in the military, when writing formal correspondence such as a business letter, is to use the full rank followed by the individual’s last name.
Therefore, you would address the letter to “Lieutenant Colonel Last Name,” both in the recipient’s address and in the salutation. For example, if the Lieutenant Colonel’s last name is Smith, the address would be:
Dear Lieutenant Colonel Smith:
In case you have additional context about the person’s achievements or responsibilities, such as being a “Distinguished Military Graduate” or having “top security clearance,” you may mention these inside the content of your letter to acknowledge their accomplishments. However, these do not influence the official title used in the address or salutation.