That would be 1st special forces operational detachment-delta (delta force). a close second would be navy DEVGRU (or SEAL team-six), but as Delta force is older, they have more experience and expertise.
A top notch pilot is referred to as an ace.
"top notch" means "first class", "among the best ", "a-one". Example: Our school has a top notch baseball team.
It means superior, first rate, the best
There are a number of top notch agencies. It is impossible to say quantitatively which on is the best.
Top-Notch Magazine ended in 1937.
Top-Notch Magazine was created in 1910.
Very few, but they did have difficulty finding a top notch General to lead thier forces.
They are the only official US Army Special Forces unit; they are called SF men for short. Any other such men or units are also categorized as "special operations units" but that is simply a catch all phrase to avoid using a lot of confusing terms. "Special forces" is used generically in other countries, but in the US, it specifically means only the Green Berets.Now, the best Green Berets are asked to try out for Delta Force, with only the top 0.1% making it in. Delta is a "special operations" unit, not "Special Forces," but they are more elite.
They work both in groups and solo operations. They could be the best special forces organization in the world as they are selected from the best of the best special forces from Army Rangers, Green Berets, Navy SEALs, Marine Corps Force Recon, Air Force Pararescue, etc. etc. Ontop of being the best special operators, having the most experience, and most highly trained, they still undergo even futher advanced training in special weapons and tactics, much of which are top secret.
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Stradivarius Violin would probably be the best for quality sound in a quartet. These violins are top notch instruments.
c. 1577 from 'otch', from Middle French 'oche' (notch) Old French 'ochier' " to notch". Top notch would indicate an arrow notch that could be brought to the bowstring and 'notched' quickly, increasing bowman's rate of fire