Modern Usage
In the United States Army and the United States Marine Corps, a lieutenant colonel typically commands a battalion-sized unit (300 to 1,200 soldiers/marines), with a major as second-in-command and a command sergeant major as principal NCO adviser. A lieutenant colonel may also serve as a brigade, regiment, or task force executive officer, or principal staff officer, S-1 (administration and personnel), S-2 (intelligence), S-3 (operations), S-4 (logistics), S-5 (civil/military affairs), or S-6 (computers and communications). Usage of "The S-n" may refer to either a specific staff section or the staff officer leading a section. Lieutenant colonels may also be junior staff at a variety of higher echelons.
In the United States Air Force, a lieutenant colonel is generally a squadron commander or director of operations in the operations group, a squadron commander in the mission support and maintenance groups, or a squadron commander or division chief in a medical group. Lieutenant colonels may also serve on general staffs and may be the heads of some wing staff departments.
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