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3.
NCO
Non Commissioned Officer. The NCO is the military. The NCO is everything new soldiers/marines/sailors wish they were. NCO's are smarter, faster, more deadly, and more ferocious than any other service member in the military. The NCO cares for the members below him and is responsible for their lives. The NCO actively demonstrates what a bad ass mother fucker should be. Crossing paths with an NCO is about the most foolish thing a new enlistee or new officer can do as the NCO will make their lives a living hell. Good officers recognize the value that well seasoned NCO's bring to the table. Privates and Seamen can only dream of being as courageous and as deadly as an NCO.
Joe/Officer: Uggggghhhhhh why are we doing dime and washer drills?

NCO: BECAUSE IF YOU PLAN ON WALKING OFF THE BATTLEFIELD ALIVE, THEN YOU BETTER SHOOT BETTER THAN THE ENEMY. DON'T MAKE ME KILL YOU.
by elwoodblues85 July 06, 2011
 
1.
NCO
Abbreviation for "Non Commissioned Officer". Only enlisted people are NCOs.
I am an NCO in the air force. And no, i don't fly an F15. Only commissioned officers do.
by TooCrooked August 30, 2003
 
2.
NCO
1. A non-commissioned officer in the armed forces.
2. Someone who stayed in the army long enough to get promoted to being "above useless".
3. A service member in the armed forces that pretends to give a damn about lower enlisted soldiers, but actually is only looking to advance their career.
4. Non-Caring Officer
5. Someone too stupid to get an actual commission.
Sure he's an NCO, but he's been in for 15 years and he's still an E-5.
by Private First Class June 18, 2008
 
4.
NCO
National Chemistry Olympiads
by baisewer April 24, 2003