Is there an official NASA-issued wristwatch that the astronauts wear on their shuttle missions, or do they just wear whatever they want? Or do they not wear any watch at all? I recently bought a Marathon TSAR from CountyComm.com, and their website says that NASA is now purchasing this watch for their personnel. This is an awesome watch, and extremely accurate. It's lost 4 SECONDS in 5 weeks. It would be nice to know that my watch is the one they're using on their missions. But I'm just curious as to what an astronaut would choose to wear.