Sam Fisher- CYPRES

  He didn’t know exactly why it was, and he’d discussed the issue with other paratroopers, but during free fall there was always a tingling sensation at the back of his neck that urged him to tempt fate and delay his chute opening. The adrenaline pumped harder, and the thrill magnified as he whispered in death’s ear: “No, not today. You can’t have me.”

  Even so, if for some reason Fisher became incapacitated or listened too intently to the siren’s call, the CYPRES would kick in and save his life. An acronym for Cybernetic Parachute Release System, the CYPRES was an automatic activation device, or AAD, that could open the chute at a preset altitude if the rate of descent was over a certain threshold.

- Blacklist Aftermath, Chapter 6