The KSK, or Kommando Spezialkräfte, is a Counter-Terrorist faction originally cut during the development of Counter-Strike: Global Offensive, but later introduced to the game as an Agent customization option in Operation Shattered Web.
3rd Commando Company
“An elite soldier from Germany's Kommando Spezialkräfte, members of 3rd Commando Company are hand-picked to be part of KSK's Operational Forces. This is not relevant to the task at hand.”
- Kommando Spezialkräfte at Wikipedia