A Lieutenant Colonel is a senior military officer rank, typically found in the armies, air forces, and marine corps of various countries. This rank is usually above a Major and below a Colonel. Lieutenant Colonels often command a battalion or serve in high-level staff positions, playing a crucial role in planning and executing military operations. In many armed forces, the rank of Lieutenant Colonel is denoted by a specific insignia, which varies by country. Officers at this rank are responsible for training and leading their troops, ensuring operational readiness, and maintaining discipline within their units.