The regimental commander is the largest, the battalion commander is second, and the company commander is the smallest.
Regiment commander, battalion commander, and company commander are three different rank command positions in the military, and they differ in rank and responsibility. As the supreme commander of the regiment, the regimental commander is the central figure of the entire regiment, with the highest military rank and a wide range of responsibilities. They are responsible for formulating strategic plans, leading and managing commanders at all levels within the regiment, organizing and implementing training, etc., to ensure the normal operation of the regiment and the improvement of combat effectiveness. 
The battalion commander is the supreme commander of the battalion, who has a lower rank and a narrower area of responsibility. As the leader of the battalion, they are required to carry out the orders of the regiment commander, direct and manage the training and operations of the battalion. They need to ensure the quality of discipline and training of the personnel in the battalion, while also organizing and implementing various military tasks. 
The company commander is the company's supreme commander, with the lowest rank and the most specific areas of responsibility. They are responsible for organizing and implementing training, managing company personnel, and maintaining company discipline. As the leader of the company, they need to ensure the safety and stability of the personnel within the company, while also organizing and implementing various military tasks. 
In the military, ranks are determined according to positions and ranks, and the regimental commander, as a higher-ranking commander, has a higher rank and a wider range of responsibilities. This is because regiments are larger military units and usually consist of several battalions, which in turn consist of several companies. Thus, in rank, the regiment is greater than the battalion commander, and the battalion is larger than the company commander. This hierarchy ensures that the command and management of the army is in order, while also guaranteeing the combat effectiveness and efficiency of the army. Explore hardcore knowledge