I don't have any cool stories, but I note that Bill Rapier (Amtac Shooting and retired from DEVGRU) considers a covert draw to be an important skill. From his article "What is Most Important in Training"
Full article here:
https://www.amtacshooting.com/what-i...20More%20items
ETA: Panone has a story about a covert draw he performed in Iraq. As I recall, he did not require silence as he was in a vehicle. He accessed the pistol covertly and achieved the desired degree of surprise when he presented it at close range. He did it weak hand too, so as not to move his hand off the steering wheel and telegraph the draw.