In US context, it applies specifically to the US Army's SF group, known to the public as the Green Berets, who specialize in behind-the-lines operations such as hit-and-run tactics, intelligence gathering and moreover, gathering the support of locals to train and support militias for counter-insurgency purposes.
As a US-specific umbrella term, it also applies to the Army Rangers (of which the late football star Pat Tillman was with), the Air Forces Pararescue Jumpers (PJ's for short), the iconic Navy SEALs, and the Force Recon Marines, who for all intents and purposes do the same job as the aforementioned SEALs.
- hostage rescues
- hit-and-run missions
- "painting" targets for airstrikes
- the occasional peacetime humanitarian aid (Green Berets especially)