General:
* Top: A general term for a leader, often used for a sergeant.
* Pops: Another general term for a leader, often used for a sergeant or a higher-ranking officer.
* Old Man: A common term for a sergeant or a leader.
* First Shirt: A term for a first sergeant, the senior enlisted person in a unit.
Army:
* D.I. (Drill Instructor): Used for a Sergeant in basic training.
* Gunny: Though typically associated with the Marines, "Gunny" can be used for a Sergeant in the Army, particularly in infantry units.
Marines:
* Gunny: The most common slang term for a Gunnery Sergeant (E-7).
* Staff Sergeant: "Staff" is often used to refer to a Staff Sergeant (E-6).
Navy:
* Chief: Used for a Chief Petty Officer (E-7) and above.
* LPO (Leading Petty Officer): This refers to a Petty Officer First Class (E-6) who is in charge of a specific division or department.
Air Force:
* Tech Sergeant: "Tech" is often used to refer to a Technical Sergeant (E-6).
* Master Sergeant: "Master" is often used to refer to a Master Sergeant (E-7).
Important note: Military slang can vary greatly depending on the unit, location, and even the individual using it. It's always good to be mindful of the context and audience when using slang terms.