Final answer:
Sub-unified and JTF commanders hold command and control responsibilities in military operations, managing communication and discipline and adapting to technological advancements in warfare.
Step-by-step explanation:
Sub-unified commanders and Joint Task Force (JTF) commanders exercise command and control over military operations. This involves directing large and small-scale military forces, instituting signs and signals for communication, and ensuring discipline within the ranks. Commanders must establish new protocols, oversee state governments and draft constitutions within their jurisdiction, as shown by historical acts such as the one overriding President Johnson's veto. They centralize military efforts following the sovereign's strategy, command the different branches of the armed forces, and adapt to innovations like autonomy and robotics on the battlefield, characterizing future combat scenarios. Moreover, as Sun Tzu implies in his writings, the success of military operations often relies on the discipline and obedience of the forces, and the mutual confidence between the general and their troops.