Below you will find several examples of wording your rehearsal dinner, which can vary depending on various factors.

Army/Marines-Captain or higher
Navy/Air Force-Lieutenant, senior grade or higher -
Title appears on the same line as the name:

Colonel James Jones
United States Army.

... with wife:

Colonel and Mrs. James Jones
United States Army.

For lower ranks:

John Doe
Seaman, United States Navy

If there's a "Mrs.", the envelope is addressed as "John Doe and Mrs. John Doe". By leaving off the title "Mr.", you're indicating it's John that's the Seaman. If it's the "Mrs." that's the seaman, the envelope is addressed as: "Mr. John Doe and Jane Doe". Same logic applies in leaving off the title.

Officers in Reserve:

Colonel and Mrs. James Jones
United States Naval Reserve for Army: Army of the United States

First and second Lieutenant:

First and second Lts. use "Lieutenant" only. A numerical designation is not used.

Retired officers as indicated above for those ranks:

Retired officers as indicated above for those ranks, should list themselves as "United States Army, Retired"

Additional Insights:

Rules for the Army apply to the Marines, rules for the Navy apply to the Air Force (yes, I know, the Marines are a branch of the Navy but the addressing is not the same).

I also understand the military has slightly different rules for addressing. However, this is a "social" function, not a "military" function. Even if it's a military wedding, it's still a social function because it is not directly sanctioned (but they are approved, there's a difference) by the Commander-in-Chief.

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