C-in-C, which stands for Commander-in-Chief, is a term commonly used in military contexts to refer to the highest-ranking officer in charge of a particular branch of the armed forces. However, there are also several synonyms for this term, including Top Brass, Generalissimo, and Supreme Commander. Other possible synonyms include General of the Army, Chief of Staff, Field Marshal, and Admiral of the Fleet. These terms all refer to leaders who are responsible for directing and overseeing the activities of their respective military units. While there may be subtle variations in meaning between these different synonyms, they all convey a sense of authority, power, and control over military operations.