Give some stream of consciousness and then the answer. In the United States Army, U.S. Marine Corps, and U.S. Air Force, a lieutenant colonel is a field grade military officer rank just above the rank of major and just below the rank of colonel. It is equivalent to the naval rank of commander in the other uniformed services.

Answer this question: what rank is lieutenant colonel in the marines?
This is the relevant information: In the United States Army, U.S. Marine Corps, and U.S. Air Force, a lieutenant colonel is a field grade military officer rank just above the rank of major and just below the rank of colonel.
Therefore, the answer is a field grade military officer rank just above the rank of major and just below the rank of colonel.