The C-A-T® is a single-use medical device and has no shelf life as long as it remains unused, in protective packaging, and stored in a dry, dark, climate-controlled space.
Why do we mark the time when we place a tourniquet? Initially, marking that time on the tourniquet allows that next level of medical care to know when that tourniquet was placed and if it's safe to remove.
North American Rescue's NAR Doc (Dr. Ethan Miles) helps us understand just how small of a limb the Combat Application Tourniquet (C-A-T®) will work on - which is a pediatric-sized limb.