Re: Starfleet Marine Corps
^ It's inherent in the very meaning of the words: From wikipedia:
The word "admiral" in Middle English comes from Anglo-French amiral, "commander", from Medieval Latin admiralis, admirallus. These themselves come from Arabic "amir", or amir-al- أمير الـ, "commander of the" (as in amir-al-bahr أمير البحر "commander of the sea").[
The rank of general came about as a "captain-general", the captain of an army in general (i.e., the whole army). The rank of captain-general began appearing around the time of the organization of professional armies in the 17th century. In most countries "captain-general" contracted to just "general".
There will be order.