Most experts consider SAD/SOG the premiere force for unconventional warfare (UW), whether that warfare consists of either creating or combating an insurgency in a foreign country.[7][24][25]

In the 2003 book, "Special OPS: America's elite forces in 21st century combat", the author states:

"Highly classified, the SAD is regarded as the preeminent special operations unit in the world. Members are the elite of the elite; "the best period." This results from the sources from which the organization recruits its members: Special missions units (SMUs); such as Delta Force and NSWDG (United States Naval Special Warfare Development Group).

[link to en.wikipedia.org]